v. t. [ 1st pref. un- + sin. ] To deprive of sinfulness, as a sin; to make sinless. [ Obs. ] Feltham. [ 1913 Webster ]
a. Not sincere or pure; insincere. [ Obs. ] Dryden. --
n. The quality or state of being unsincere or impure; insincerity. [ Obs. ] Boyle. [ 1913 Webster ]
v. t. [ 1st pref. un- + sinew. ] To deprive of sinews or of strength. [ R. ] Dryden. [ 1913 Webster ]