IPA: /ˈræmpəntli/
KK: /ˈræmpəntli/
In a way that is uncontrolled or spreading quickly and widely.
The weeds grew rampantly in the garden, taking over the flowers.
Rampantly → It is formed from "ramp" (from Middle English *rampe*, meaning to rear up or leap) and "-antly" (a suffix indicating a manner or state). The word "rampantly" describes something that is done in a wild or uncontrolled manner, as if leaping or rearing up uncontrollably.
Imagine something that is 'leaping' or 'rearing up' wildly — that's what 'rampantly' means, describing actions that are uncontrolled or excessive.