desuetude

desuetude --- de sue can be remembered as Disuse.

anagram for "dude use et" or you know... since it's not in use... in desuetude

DESUETUDE = DESOLATE-tude. Abandoned (desolate) things are disused (in desuetude).

desuetude = des (country)+ uetude(quietude); Country is quietude. Country is keeping salience i.e inactive state.

des(des) uth(ue) ati-tude is disused by stae minister