characterized by wildness or absence of restraint, e.g. of opinion or action
a rampant militarist
spreading or growing unchecked
a rampant crime wave
(usu used after a noun) said of a heraldic animal: rearing up on one hind leg with forelegs extended
a lion rampant
rampancy /-si/ noun
rampantly adv
[Middle English from early French rampant, present part. of ramper to crawl]