The Collaborative International Dictionary
Insuetude
Insuetude \In"sue*tude\, n. [L. insuetudo, from insuetus unaccustomed; pref. in- not + suetus, p. p. of suescere to be accustomed.] The state or quality of being unaccustomed; absence of use or habit.
Absurdities are great or small in proportion to custom
or insuetude.
--Landor.
Wiktionary
insuetude
n. (context archaic English) The state or quality of being unaccustomed; absence of habit.