"rampant" in the adjective sense
1. rampant
unrestrained and violent
"rampant aggression"
2. rampant, rearing
rearing on left hind leg with forelegs elevated and head usually in profile
"a lion rampant"
3. rampant
of a plant) having a lush and unchecked growth
"a rampant growth of weeds"
Source: WordNet® (An amazing lexical database of English)
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