LATIN DICTIONARYLexicon Latīnum
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“drowsiness” in Latin

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

drowsiness
Sleepiness; as state, and in one particular instance, somni necessitas: oscitatio (in as far as it manifests itself by yawning): an irresistible drowsiness, inexpugnabilis paene somni necessitas.
As inherent quality of the individual, veternus: ☞ somnolentia not before Sidon., Ep., 2, 2, med.
IMPROPR. tarditas: segnitas: ignavia: inertia. (The words are found in this connection and order.) tarditas et ignavia. SYN. in IDLENESS.

Quick answer

What is the Latin word for drowsiness?
The usual Latin words for “drowsiness” are oscĭtātĭo, veternus, tarditās; also sēgnitās, ignāvia, iners. 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.