1. (a.) Sensible to slight touches; easily tickled; as, the sole of the foot is very ticklish; the hardened palm of the hand is not ticklish.

2. (a.) Standing so as to be liable to totter and fall at the slightest touch; unfixed; easily affected; unstable.

3. (a.) Difficult; nice; critical; as, a ticklish business.

Herculean abstruse allergic anaphylactic arduous awkward brutal capricious changeable complex critical dangerous delicate demanding desultory difficile difficult empathetic empathic exacting fickle formidable fragile goosy hairy hard hard-earned hard-fought hazardous high-strung hyperesthetic hyperpathic hypersensitive infirm insecure insubstantial intricate irritable itchy jawbreaking knotted knotty laborious mean mercurial miffy nervous no picnic not easy on slippery ground on thin ice operose overrefined oversensible oversensitive overtender passible perilous precarious prickly provisional refined responsive rigorous risky rocky rough rugged sensitive set with thorns severe shaky shifting shifty skittish slippery slippy spiny steep strenuous supersensitive sympathetic tactful temperamental temporary tender tentative tetchy thin-skinned thorny tickling tickly titillative toilsome touch-and-go touchy tough treacherous tricky uncertain undependable unfaithworthy unreliable unsettled unsolid unsound unstable unsteadfast unsteady unsubstantial unsure untrustworthy uphill variable volatile wicked