The Collaborative International Dictionary of English v.0.48:
Intransitively \In*tran"si*tive*ly\, adv. (Gram.) Without an object following; in the manner of an intransitive verb. [1913 Webster]WordNet (r) 3.0 (2006):
intransitively adv 1: in an intransitive manner; "you can use the verb `drink' intransitively, without a direct object" [ant: transitively]