- ticklish (adj.)
[ticklish 词源字典]
- "easily tickled," 1590s, from tickle + -ish. Literal sense is attested later than the figurative sense "easy to upset" (1580s). An earlier word for this was tickly (1520s). Meaning "difficult to do, dubious, requiring great care" is from 1590s. Related: Ticklishly; ticklishness.[ticklish etymology, ticklish origin, 英语词源]