intransitively

from 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}]

from 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]

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