Hindi adjectives split into two groups and only one of them causes trouble. Adjectives ending in आ change to match the noun; everything else is frozen. That single distinction covers ninety percent of what you need. Comparisons then work in a way English speakers find odd, because Hindi has no word for than and builds the whole thing differently.
The Two Groups
Look at the ending and you know immediately whether an adjective will change.
Ends in आ: it inflects. Ends in anything else: it is frozen. So अच्छा becomes अच्छी and अच्छे, while सुंदर stays सुंदर for a man, a woman, or a hundred buildings. Most Sanskrit and Persian borrowings fall into the frozen group.
How the Changing Group Behaves
Three forms cover it: आ for masculine singular, ई for feminine, ए for masculine plural. Feminine plural keeps the ई form — अच्छी लड़कियाँ. The adjective takes its cue from the noun, so knowing the noun’s gender is a prerequisite, which is why gender and adjectives should be learned together.
Adjectives also shift to ए in the oblique, just as nouns do: अच्छे लड़के को, बड़े घर में. The postposition pulls both words along with it.
Comparisons Without a Word for Than
Hindi does not have a comparative form like bigger or a word meaning than. It uses से, the postposition meaning from.
The structure is literally ‘this from that big is’. For superlatives, सबसे means ‘from all’ and therefore ‘the most’ — सबसे बड़ा is the biggest, सबसे अच्छा the best. This is one construction that, once learned, needs no exceptions.
बहुत does most of the work and never changes form. थोड़ा does change — थोड़ी चीनी, थोड़ा पानी — because it ends in आ. And इतना is used for emphasis in a way English handles with intonation: इतना महँगा! means ‘so expensive!’ with genuine surprise built into the word.
Cultural Note
Certain adjectives carry social weight in India that their translations do not. गोरा (fair-skinned) has historically been used as a compliment, and the skin-lightening industry built on it is now widely criticised, with major brands renaming products after public pressure. A learner should know the word exists and understand why using it as praise lands badly with many Indians today.
Similarly, मोटा (fat) is used far more directly than in English-speaking countries, often affectionately within families. Comments on weight are not intended as insults, though the bluntness surprises visitors.
The adjective सीधा means straight, but applied to a person it means simple, guileless or easily taken advantage of. सीधा आदमी is both a compliment and a quiet warning.
Pronunciation Tips
The three endings must be distinct: अच्छा, अच्छी, अच्छे have clearly different final vowels and blurring them loses the agreement. अच्छा doubles the aspirated chh. बहुत has a soft middle h and a clean final t. काफ़ी carries a nukta f. And ज़्यादा opens with a z cluster that runs into the y — one motion, not two syllables.
Common Mistakes
- Inflecting frozen adjectives, as in सुंदरी लड़की. सुंदर never changes.
- Failing to inflect अच्छा with a feminine noun.
- Forgetting that adjectives also go oblique: बड़े घर में, not बड़ा घर में.
- Trying to translate than literally instead of using से.
- Treating थोड़ा as frozen. It ends in आ, so it changes.
Practice Exercises
- Sort ten adjectives you know into the changing and frozen groups.
- Use अच्छा with a masculine, feminine and plural noun.
- Build five comparisons using से and three superlatives using सबसे.
- Put three adjective-noun pairs into the oblique with में.
- Describe five objects around you with correctly agreeing adjectives.