rampant /ˈɹæm.pənt/adjective 5adverb 1forms 2phrases 1 adjective5 •Unrestrained or unchecked, usually in a negative manner.Weeds are rampant in any neglected garden. •Rife, or occurring widely, frequently or menacingly.There was rampant corruption in the city. •Rearing on both hind legs with the forelegs extended.The Vienna riding school displays splendid rampant movement. •Rearing up, especially on its hind leg(s), with a foreleg raised and in profile.‘I forget your coat of arms.’ ‘A human foot d’or, in a field azure; the foot crushes a serpent rampant whose fangs are imbedded in the heel.’ — 1846 •Tilted, said of an arch with one side higher than the other, or a vault whose two abutments are located on an inclined plane. adverb1 •(informal, nonstandard) Rampantly.Things seem to be running rampant around here lately. formsmore rampant · most rampant Phrases with rampant run rampantTo go unchecked or without control; to be wild or excessive.