The Oxford Thesaurus An A-Z Dictionary of Synonyms - rampant adj.

1) unchecked, uninhibited, unrestrained, wild, uncontrolled, out of control, out of hand, frenzied, unbridled, uncontrollable, violent: He was a victim of rampant jealousy. Jennie could hardly be described as a rampant feminist. 2) profuse, unbounded, abounding, flourishing, rife, widespread, everywhere, epidemic, pandemic, prevalent, unrestrained, unchecked, running wild, uninhibited, indiscriminate, wild, uncontrolled; in control, holding sway, in full sway, dominant, predominant; exuberant, rank, luxuriant: Before Masterson became sheriff, vice and crime were rampant in the town.