The Collaborative International Dictionary
Unwonted \Un*wont"ed\ ([u^]n*w[u^]nt"[e^]d), a.
Not wonted; unaccustomed; unused; not made familiar by practice; as, a child unwonted to strangers.
--Milton.Uncommon; unusual; infrequent; rare; as, unwonted changes. ``Unwonted lights.''
--Byron. [1913 Webster] -- Un*wont"ed*ly, adv. -- Un*wont"ed*ness, n.
Wiktionary
adv. unusually
WordNet
adv. in an unusual manner
Usage examples of "unwontedly".
Dale had become unwontedly talkative and Froud was watching with a quiet amusement the enthusiastic back slapping in progress between him, the doctor and Dugan.
Older, fatter, and unwontedly quiet though he was, I knew Milo Papple in an instant.
They were Jim Warren, who was our part-time village policeman, and George and Garnet Harper, a couple of practical jokers who on this occasion looked unwontedly solemn.