From The Collaborative International Dictionary of English v.0.48 [gcide]:
2. (Gram.) Not transitive; not passing over to an object; expressing an action or state that is limited to the agent or subject, or, in other words, an action which does not require an object to complete the sense; as, an intransitive verb, e. g., the bird flies; the dog runs.
Note: Intransitive verbs have no passive form. Some verbs which appear at first sight to be intransitive are in reality, or were originally, transitive verbs with a reflexive or other object omitted; as, he keeps (i. e., himself) aloof from danger. Intransitive verbs may take a noun of kindred signification for a cognate object; as, he died the death of a hero; he dreamed a dream. Some intransitive verbs, by the addition of a preposition, become transitive, and so admit of a passive voice; as, the man laughed at; he was laughed at by the man.
From WordNet (r) 3.0 (2006) [wn]:
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