Etymology
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oscitant (adj.)

"sleepy, drowsy, sluggish," literally "yawning, gaping," 1620s, from Latin oscitans "listless, sluggish, lazy," present participle of oscitare "to gape, yawn," from os citare "to move the mouth" (see oral and cite). Related: Oscitancy.

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Definitions of oscitant

oscitant (adj.)
showing lack of attention or boredom;
Synonyms: drowsy / yawning
From wordnet.princeton.edu