LATIN DICTIONARYLexicon Latīnum
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“drowsy” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

drowsy
Sleepy (in one instance), dormitans: somni plenus: somno gravis (heavy with sleep): somni indigens (needing sleep): oscitans (yawning). To be or feel drowsy, dormitare (i. e., to begin to sleep, to fall asleep); somni indigere (have need of sleep); somno urgeri ultra debitum (to feel unnaturally sleepy); oscitare (to yawn). In a drowsy manner [Vid: DROWSILY].
As quality, somniculosus; somno deditus: ☞ somnolentus later only.
IMPROPR. = slow; tardus: lentus: segnis (SYN. in IDLE).
The drowsy disease, inexpugnabilis paene somni necessitas (Cels., 3, 20, in.): veternus: lethargia (ληθαργία; lethargy, Vid :).

Quick answer

What is the Latin word for drowsy?
The usual Latin words for “drowsy” are dormītō, ōscitō, somnīculōsus; also tardus, lentus, sēgnis. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.