The Collaborative International Dictionary of English v.0.48:
Ticklish \Tic"klish\, a.
1. Sensible to slight touches; easily tickled; as, the sole
of the foot is very ticklish; the hardened palm of the
hand is not ticklish. --Bacon.
2. Standing so as to be liable to totter and fall at the
slightest touch; unfixed; easily affected; unstable.
Can any man with comfort lodge in a condition so
dismally ticklish? --Barrow.
3. Difficult; nice; critical; as, a ticklish business.
Surely princes had need, in tender matters and
ticklish times, to beware what they say. --Bacon.
[1913 Webster] -- Tic"klish*ly, adv. --