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acute (adj.)[acute 词源字典]: late 14c., originally of fevers and diseases, "coming and going quickly" (opposed to a chronic), from Latin acutus "sharp, pointed," figuratively "shrill, penetrating; intelligent, cunning," past participle of acuere "sharpen" (see acuity). Meaning "sharp, irritating" is from early 15c. Meaning "intense" is from 1727. Related: Acutely; acuteness.[acute etymology, acute origin, 英语词源]
sharply (adv.): Old English scearplice "acutely, keenly; painfully, severely; attentively, quickly;" see sharp (adj.) + -ly (2). Old English also had adverbial form scearpe "sharply."