英语词源字典 - 在线词源网站

composed (adj.): "calm, tranquil," c. 1600, past participle adjective frome compose (v.). Related: Composedly; composedness.
disposed (adj.): mid-14c., "inclined, in the mood," past participle adjective from dispose. Meaning "in a certain condition" is late 14c.; "arranged" is 15c.
indisposed (adj.): c. 1400, "unprepared;" early 15c., "not in order," from in- (1) "not" + disposed; or else from Late Latin indispositus "without order, confused." Mid-15c. as "diseased;" modern sense of "not very well" is from 1590s. A verb indispose is attested from 1650s but is perhaps a back-formation of this.
supposed (adj.): "believed or thought to exist," 1580s, past participle adjective from suppose (v.); often with the -e- pronounced, to distinguish it from the passive past tense supposed, now common in the sense of "to have a duty or obligation" (1859).
supposedly (adv.): "as may be supposed, presumably," 1610s, from supposed + -ly (2).
underexposed (adj.): 1861, in photography, from under + past participle of expose (v.).
unopposed (adj.): 1650s, from un- (1) "not" + past participle of oppose (v.).