accurate (adj.)youdaoicibaDictYouDict
1610s, "done with care," from Latin accuratus "prepared with care, exact, elaborate," past participle of accurare "take care of," from ad- "to" (see ad-) + curare "take care of" (see cure (n.1)). The notion of doing something carefully led to that of being exact (1650s). Related: Accurately; accurateness.
deliberate (adj.)youdaoicibaDictYouDict
early 15c., "done with careful consideration," from Latin deliberatus "resolved upon, determined," past participle of deliberare (see deliberation). Meaning "slow, consciously unhurried" is attested by 1590s. Related: Deliberately.
elegant (adj.)youdaoicibaDictYouDict
late 15c., "tastefully ornate," from Middle French élégant (15c.), from Latin elegantem (nominative elegans) "choice, fine, tasteful," collateral form of present participle of eligere "select with care, choose." Meaning "characterized by refined grace" is from 1520s. Latin elegans originally was a term of reproach, "dainty, fastidious;" the notion of "tastefully refined" emerged in classical Latin. Related: Elegantly.
Elegant implies that anything of an artificial character to which it is applied is the result of training and cultivation through the study of models or ideals of grace; graceful implies less of consciousness, and suggests often a natural gift. A rustic, uneducated girl may be naturally graceful, but not elegant.
equerry (n.)youdaoicibaDictYouDict
royal officer, especially one charged with care of horses, 1590s, short for groom of the equirrie, from esquiry "stables" (1550s), from Middle French escuerie (Modern French écurie), perhaps from Medieval Latin scuria "stable," from Old High German scura "barn" (German Scheuer); or else from Old French escuier "groom," from Vulgar Latin scutarius "shield-bearer." In either case, the spelling was influenced by Latin equus "horse," which is unrelated.
seethe (v.)youdaoicibaDictYouDict
Old English seoþan "to boil," also figuratively, "be troubled in mind, brood" (class II strong verb; past tense seaþ, past participle soden), from Proto-Germanic *seuthan (cognates: Old Norse sjoða, Old Frisian siatha, Dutch zieden, Old High German siodan, German sieden "to seethe"), from PIE root *seut- "to seethe, boil."

Driven out of its literal meaning by boil (v.); it survives largely in metaphoric extensions. Figurative use, of persons or populations, "to be in a state of inward agitation" is recorded from 1580s (implied in seething). It had wider figurative uses in Old English, such as "to try by fire, to afflict with cares." Now conjugated as a weak verb, and past participle sodden (q.v.) is no longer felt as connected.