Meaning of “drowsy” in the English Dictionary

"drowsy" in British English

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drowsyadjective

uk /ˈdraʊ.zi/ us /ˈdraʊ.zi/

being in a state between sleeping and being awake:

The room is so warm it's making me feel drowsy.
drowsily
adverb uk /ˈdraʊ.zəl.i/ us /ˈdraʊ.zəl.i/
drowsiness
noun [ U ] uk /ˈdraʊ.zi.nəs/ us /ˈdraʊ.zi.nəs/

Seasickness medication often causes drowsiness.

(Definition of “drowsy” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"drowsy" in American English

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drowsyadjective

us /ˈdrɑʊ·zi/

feeling sleepy esp. when it is not the usual time to sleep:

The room is so warm it’s making me drowsy.
drowsiness
noun [ U ] us /ˈdraʊ·zi·nəs/

(Definition of “drowsy” from the Cambridge Academic Content Dictionary © Cambridge University Press)