Bigger, Best: The Arabic Comparative and Superlative (أَفْعَل)
English builds 'bigger' and 'biggest' with endings; Arabic does it by pouring the adjective's root into a new template. Take كَبِير (kabīr, 'big'), extract the root ك-ب-ر, and cast it in the pattern أَفْعَل (afʿal): the result is أَكْبَر (akbar), which serves as both 'bigger' and 'biggest' depending on the construction around it. This is the same root-and-pattern machinery that powers all of Arabic morphology.
One form, two jobs: followed by مِنْ (min, 'than'), أَكْبَر is a comparative — أَكْبَرُ مِنْ بَيْتِي, 'bigger than my house'. Placed before an indefinite singular noun in an idafa, it is a superlative — أَكْبَرُ مَدِينَةٍ, 'the biggest city'. This guide covers both constructions with full harakat, feminine forms like الْكُبْرَى, the workaround for adjectives that refuse the template, and the irregulars خَيْر and شَرّ that the Quran uses constantly.
The أَفْعَل pattern: one template for degree
To form the comparative of most simple adjectives, place the three root consonants into أَفْعَل: hamza with fatḥa, first radical with sukūn, second radical with fatḥa, third radical. كَبِير ('big') gives أَكْبَر (akbar); صَغِير ('small') gives أَصْغَر (aṣghar); جَمِيل ('beautiful') gives أَجْمَل (ajmal); قَرِيب ('near') gives أَقْرَب (aqrab).
Roots with quirks adapt predictably. Doubled roots collapse the last two radicals: شَدِيد ('intense') gives أَشَدّ (ashadd). Roots ending in a weak letter finish with alif maqṣūra: حُلْو ('sweet') gives أَحْلَى (aḥlā), ذَكِيّ ('clever') gives أَذْكَى (adhkā).
Grammatically, أَفْعَل words are diptotes: they never take tanwīn, so it is أَكْبَرُ, never أَكْبَرٌ. And in the comparative construction the form is frozen — it does not change for gender or number. A woman is أَطْوَلُ مِنْ أَخِيهَا ('taller than her brother') with exactly the same أَطْوَل a man would get.
The comparative: أَكْبَرُ مِنْ
The comparative formula is simply أَفْعَل + مِنْ + the thing compared, and since مِنْ is a preposition, what follows it is genitive: الْقَاهِرَةُ أَكْبَرُ مِنْ بَيْرُوتَ (al-qāhiratu akbaru min bayrūta), 'Cairo is bigger than Beirut.' Think of مِنْ here as 'than', even though it is the same word as 'from' — 'bigger from Beirut' is how Arabic frames it.
The comparison target can be a pronoun (أَكْبَرُ مِنْهُ, 'bigger than it'), a noun, or a clause, and the مِنْ phrase can be dropped when context supplies it: اَلْيَوْمَ أَفْضَلُ ('today is better') works fine on its own.
Word order stays normal nominal-sentence order: subject, then the comparative as predicate. Fahm's grammar course drills this construction in its A2 lesson on the comparative and superlative.
The superlative: idafa and the definite article
Arabic has two main superlative constructions, and the more common one is beautifully compact: put the أَفْعَل form directly before an indefinite singular genitive noun, forming an idafa. أَكْبَرُ مَدِينَةٍ (akbaru madīnatin) is literally 'biggest of city' and means 'the biggest city'. Note both halves of the surprise: the noun is singular even when English wants a plural idea, and the phrase is definite in meaning even though no الْـ appears — because the first term of an idafa never takes the article.
The same idafa also works with a definite plural: أَكْبَرُ الْمُدُنِ (akbaru al-muduni), 'the biggest of the cities'. In either version the أَفْعَل form stays masculine singular — أَكْبَرُ مَدِينَةٍ, even though مَدِينَة is feminine.
The second construction makes the أَفْعَل word a definite adjective following its noun, and here it does agree in gender. The feminine of the superlative uses the فُعْلَى pattern: الْمَدِينَةُ الْكُبْرَى (al-madīnatu al-kubrā), 'the greatest city'; الصُّغْرَى ('the smallest'), الْفُضْلَى ('the best'), الْعُظْمَى ('the greatest') — as in بَرِيطَانْيَا الْعُظْمَى, 'Great Britain'. These فُعْلَى forms live almost entirely inside this definite construction, mostly in titles and formal prose.
The irregulars: خَيْر and شَرّ
Arabic's most frequent 'better' and 'worse' do not look like أَفْعَل at all. خَيْرٌ (khayrun) means 'better/best' and شَرٌّ (sharrun) means 'worse/worst', used directly with مِنْ or in idafa with no hamza prefix. They are everywhere in the Quran and in proverbs: الْآخِرَةُ خَيْرٌ مِنَ الدُّنْيَا ('the Hereafter is better than this world').
Classical grammar explains them as أَفْعَل forms that lost their hamza, but خَيْر and شَرّ are the standard. A famous hadith uses the idafa superlative: خَيْرُكُمْ مَنْ تَعَلَّمَ الْقُرْآنَ وَعَلَّمَهُ ('the best of you is the one who learns the Quran and teaches it'). Reading verses with خَيْر in Fahm's word-by-word Quran reader makes these forms feel native fast.
When the pattern will not fit: أَكْثَر and أَشَدّ + tamyīz
Some adjectives cannot be squeezed into أَفْعَل. Colors and physical-defect adjectives already use the أَفْعَل pattern for their base form (أَحْمَر is simply 'red', not 'redder'), and derived adjectives like participles (مُجْتَهِد, 'hardworking') have too much structure to recast. For these, Arabic uses a helper — أَكْثَر ('more'), أَشَدّ ('more intense'), or أَقَلّ ('less') — followed by an indefinite accusative noun of specification, the tamyīz.
So 'more hardworking' is أَكْثَرُ اجْتِهَادًا (aktharu ijtihādan), literally 'more, in terms of diligence', and 'bluer' is أَشَدُّ زُرْقَةً (ashaddu zurqatan), 'more intense in blueness'. The accusative tanwīn on the tamyīz noun is the signature of this construction — the same tamyīz you meet after كَمْ, and which Fahm's B2 grammar track treats in its own lesson.
Because أَفْعَل forms are built straight from roots, the dictionary is your friend: meet أَوْسَع in the wild, search the root و-س-ع in Fahm's root search, and you land on وَاسِع ('wide') and its whole word family — exactly how comparatives are meant to be decoded.
Frequently asked questions
Is أَكْبَر 'bigger' or 'biggest'?
Both — the construction decides. With مِنْ it is comparative: أَكْبَرُ مِنْ بَيْتِي, 'bigger than my house'. In an idafa with an indefinite singular noun it is superlative: أَكْبَرُ مَدِينَةٍ, 'the biggest city'. As a definite adjective it is also superlative: الْمَسْجِدُ الْأَكْبَرُ.
Why is the noun singular in أَكْبَرُ مَدِينَةٍ?
The superlative idafa requires an indefinite singular genitive noun: literally 'biggest of city'. To use a plural, make it definite: أَكْبَرُ الْمُدُنِ, 'the biggest of the cities'. Both constructions mean the same thing.
Does the comparative agree with a feminine subject?
No — in the comparative with مِنْ, the أَفْعَل form is invariable: هِيَ أَطْوَلُ مِنْ أَخِيهَا, 'she is taller than her brother'. Feminine forms like الْكُبْرَى (the فُعْلَى pattern) appear only in the definite superlative construction: الْمَدِينَةُ الْكُبْرَى.
What are خَيْر and شَرّ?
The irregular words for 'better/best' and 'worse/worst'. They work like أَفْعَل forms but have no hamza prefix: الْعِلْمُ خَيْرٌ مِنَ الْمَالِ, 'knowledge is better than wealth'. They are extremely common in the Quran, hadith, and proverbs.
How do I compare adjectives like colors or participles?
Use a helper comparative plus an accusative tamyīz noun: أَشَدُّ زُرْقَةً 'bluer' (more intense in blueness), أَكْثَرُ اجْتِهَادًا 'more hardworking'. Colors cannot take a second أَفْعَل because their base form already uses that pattern.
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