different between tactfulness vs touchy

English

From tactful +? -ness

tactfulness (usually uncountable, plural tactfulnesses)

The state or quality of being tactful.
His tactfulness allowed him to be honest without making enemies.

From a later variant of tachy, techy, teachie, tetchy, simulating touch +? -y. More at tetchy.

touchy (comparative touchier, superlative touchiest)

(of a situation) Extremely sensitive or volatile; easily disturbed to the point of becoming unstable; requiring caution or tactfulness.
It is an extremely touchy situation, with everybody's patience wearing thin.
(of a person) Easily offended; oversensitive; ticklish.
He can be very touchy when you talk about his cat, so be as tactful as possible.

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