IPA: /ˈhiːθənɪʃli/
KK: /ˈhiːθənɪʃli/
In a way that is characteristic of people who do not follow a widely accepted religion or belief system, often implying a lack of morality or civilization.
The villagers were shocked by the heathenishly wild behavior of the newcomers.
Heathenishly → It is formed from "heathen" (from Old English *hæþen*, meaning a person who is not a Christian or Jew) and the suffix "-ly" (meaning in a manner of). The word "heathenishly" describes actions or behaviors that are characteristic of a heathen, often implying a lack of civilization or religious belief.
Think of someone acting in a way that is typical of a 'heathen' — which means not following a recognized religion — and the '-ly' indicates the manner of that behavior.