英语词源字典 - 在线词源网站

frisky (adj.)[frisky 词源字典]: "gaily active," c. 1500, from Middle English adjective frisk "lively" (see frisk (v.) + -y (2). Related: Friskiness.[frisky etymology, frisky origin, 英语词源]
risky (adj.): 1825, from risk (n.) + -y (2). Riskful in same sense is from 1793. Related: Riskiness.