1) Disusage 2) Disuse 3) French word used in English 4) Inaction 5) Inactiveness 6) Inactivity 7) Inusitation 8) Lack of use 9) New brooms 10) Newness to 11) Obsolescence 12) State of inactivity 13) Want of habit 14) Want of practice 1) Disuse 
The policy of inserting sunset clauses into a constitution or charter of rights (as in Canada since 1982) or into regulations and other delegated/subordinate legislation made under an Act (as in Australia since the early 1990s) can be regarded as a statutory codification of the common-law doctrine. ==British law== The doctrine of desuetude is not ...
state of disuse
• (n.) The cessation of use; disuse; discontinuance of practice, custom, or fashion.
Des'ue·tude noun [ Latin desuetudo , from desuescere , to grow out of use, disuse; de + suescere to become used or accustomed: confer French désuétude . See Custom .] The cessation of use; disuse; discontinuance of practice, custom, or fashion. « The...
cessation of use disuse 
[n] - a state of inactivity or disuse
noun a state of inactivity or disuse
the state of being no longer used or practiced.