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ticklish (adj.)

1580s, "easy to upset," 1580s, a figurative use, from tickle + -ish. The literal sense of "easily tickled" is from 1590s, as is the other figurative sense, "difficult to do, dubious, requiring great care." An earlier word was tickly (1520s). Related: Ticklishly; ticklishness.

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Definitions of ticklish from WordNet

ticklish (adj.)
difficult to handle; requiring great tact;
hesitates to be explicit on so ticklish a matter
Synonyms: delicate / touchy
From wordnet.princeton.edu