IPA: /dɪˈtɛstəblɪ/
KK: /dɪˈtɛstəblɪ/
In a way that is very unpleasant or deserving of strong dislike.
The movie was detestably boring, making it hard to sit through.
Detestably → It is formed from "detest" (from Latin "detestari", meaning to detest or to dislike intensely) and "-ably" (meaning in a manner that can be). The word "detestably" means in a manner that is intensely disliked or abhorred.
Think of the word 'detest' which means to intensely dislike, and remember that 'detestably' describes doing something in a way that is intensely disliked.