just (adv.)youdaoicibaDictYouDict
"merely, barely," 1660s, from Middle English sense of "exactly, precisely, punctually" (c. 1400), from just (adj.), and paralleling the adverbial use of French juste. Just-so story first attested 1902 in Kipling, from the expression just so "exactly that, in that very way" (1751).
punctual (adj.)youdaoicibaDictYouDict
c. 1400, from Medieval Latin punctualis, from Latin punctus "a pricking" (see point (n.)). Originally "having a sharp point; of the nature of a point;" meaning "prompt" first recorded 1670s, from notion of "insisting on fine points." Related: Punctually.