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faintly (adv.)[faintly 词源字典]: c. 1300, "dispiritedly, timidly, half-heartedly;" early 14c. "feebly, wearily, without vigor;" from faint (adj.) + -ly (2). Meaning "indistinctly" is from 1580s. Also in Middle English, "deceitfully, hypocritically, falsely" (mid-14c.).[faintly etymology, faintly origin, 英语词源]
scarily (adv.): 1845, "timidly;" 1967, "unnervingly," in a positive sense; see scary + -ly (2).
timid (adj.): 1540s, from Middle French timide "easily frightened, shy" (16c.) and directly from Latin timidus "fearful, afraid, cowardly," from timere "to fear," of uncertain origin. Related: Timidly; timidness.