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insufficient (adj.)[insufficient 词源字典]: late 14c., from Old French insufficient (14c.), from Latin insufficientem (nominative insufficiens) "insufficient," from in- "not, opposite of" (see in- (1)) + sufficientem (see sufficient). Originally of persons, "inadequate, unable;" of things, from late 15c. Related: Insufficiently.[insufficient etymology, insufficient origin, 英语词源]
poet (n.): early 14c., "a poet, a singer" (c. 1200 as a surname), from Old French poete (12c., Modern French poète) and directly from Latin poeta "a poet," from Greek poetes "maker, author, poet," variant of poietes, from poein, poiein "to make, create, compose," from PIE *kwoiwo- "making," from root *kwei- "to pile up, build, make" (cognates: Sanskrit cinoti "heaping up, piling up," Old Church Slavonic činu "act, deed, order").

Replaced Old English scop (which survives in scoff). Used in 14c., as in classical languages, for all sorts of writers or composers of works of literature. Poète maudit, "a poet insufficiently appreciated by his contemporaries," literally "cursed poet," attested by 1930, from French (1884, Verlaine). For poet laureate see laureate.
poorly (adv.): early 13c., "inadequately, badly, insufficiently," from poor (adj.) + -ly (2). Meaning "in ill health" is from 1750.
underserve (v.): "to serve insufficiently," 1710, from under + serve (v.). Related: Underserved; underserving.