curious (adj.)youdaoicibaDictYouDict[curious 词源字典]
mid-14c., "eager to know" (often in a bad sense), from Old French curios "solicitous, anxious, inquisitive; odd, strange" (Modern French curieux) and directly from Latin curiosus "careful, diligent; inquiring eagerly, meddlesome," akin to cura "care" (see cure (n.)). The objective sense of "exciting curiosity" is 1715 in English. In booksellers' catalogues, the word means "erotic, pornographic." Curiouser and curiouser is from "Alice in Wonderland" (1865).[curious etymology, curious origin, 英语词源]
howdyyoudaoicibaDictYouDict
1837, earlier how de (1828), first recorded in Southern U.S. dialect, contraction of how do you do (1630s), phrase inquiring after someone's health; earlier how do ye (1560s).
inquire (v.)youdaoicibaDictYouDict
late 13c., from Old French enquerre "ask, inquire about" (Modern French enquérir), from Vulgar Latin *inquaerere, from Latin in- "into" (see in- (2)) + quaerere "ask, seek" (see query (v.)). Respelled 14c. on Latin model, but half-Latinized enquire still persists. Related: Inquired; inquiring; inquiringly.
inquisition (n.)youdaoicibaDictYouDict
late 14c., "judicial investigation, act or process of inquiring," from Old French inquisicion "inquiry, investigation" (12c.), from Latin inquisitionem (nominative inquisitio) "a searching into, legal examination," noun of action from past participle stem of inquirere (see inquire).

In Church history, inquisitors were appointed from 382 C.E. to root out heretics, and the Inquisition refers to the ecclesiastical court (Congregation of the Holy Office) appointed 13c. by Innocent III to suppress heresy. It never operated in Britain. The capital letter form appeared in English only after c. 1500, and usually refers to the office's reorganization 1478-1483 in Spain as what is commonly called the Spanish Inquisition.
skeptic (n.)youdaoicibaDictYouDict
also sceptic, 1580s, "member of an ancient Greek school that doubted the possibility of real knowledge," from Middle French sceptique and directly from Latin scepticus "the sect of the Skeptics," from Greek skeptikos (plural Skeptikoi "the Skeptics, followers of Pyrrho"), noun use of adjective meaning "inquiring, reflective" (the name taken by the disciples of the Greek philosopher Pyrrho, who lived c. 360-c. 270 B.C.E.), related to skeptesthai "to reflect, look, view" (see scope (n.1)).
Skeptic does not mean him who doubts, but him who investigates or researches as opposed to him who asserts and thinks that he has found. [Miguel de Unamuno, "Essays and Soliloquies," 1924]
The extended sense of "one with a doubting attitude" first recorded 1610s. The sk- spelling is an early 17c. Greek revival and is preferred in U.S. As a verb, scepticize (1690s) failed to catch on.
zetetic (adj.)youdaoicibaDictYouDict
"proceeding by inquiry," 1640s, from Modern Latin zeteticus, from Greek zetetikos "searching, inquiring," from zetetos, verbal adjective of zetein "seek for, inquire into." Related: Zetetical.