usen't

usen't

(ˈjuːsənt)
contraction of
used not
References in classic literature ?
"Usen't!" She lowered her eyes a moment to the black abyss of the past.
While avoidance of used to may well be partly due, as David Denison suggests (323), to speakers being uncomfortable with both usedn't (usen't) and didn't use--as Jorgensen amply documents--there is a semantic reason for the avoidance of negation with used to.