Hindi · Pronunciation Guide
KAA-laa, with no puff on the k and two long aa vowels of equal length.
kaalaa
Two equally heavy syllables, so treat the word as level. What makes learners' versions sound wrong is not accent placement but the collapse of the second aa into a schwa, which erases the masculine ending.
Listen: काला
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उनके बाल काले हैं।
Unke baal kaale haiṁ.
He has black hair.
Listen: उनके बाल काले हैं।
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"Unke baal kaale haiṁ" moves the adjective to kaale, the masculine plural form, because baal is being treated as plural — so the sentence quietly demonstrates that Hindi colour adjectives in -aa inflect for number as well as gender. Note unke rather than unkaa for the same reason.
Aspiration is the usual defect: "KHAA-laa" with an English puffed k crosses into a different Hindi consonant. Test it with a candle flame or a sheet of paper — nothing should move. Second, keep both vowels open and long; the word has no short vowel anywhere in it.