DETESTABLY
detestably, repulsively, abominably, odiously
(adverb) in an offensive and hateful manner; “I don’t know anyone who could have behaved so abominably”
Source: WordNet® 3.1
Etymology
Adverb
detestably (comparative more detestably, superlative most detestably)
In a detestable manner.
Source: Wiktionary
De*test"a*bly, adv.
Definition: In a detestable manner.
DETESTABLE
De*test"a*ble, a. Etym: [L. detestabilis: cf. F. détestable.]
Definition: Worthy of being detested; abominable; extremely hateful; very
odious; deserving abhorrence; as, detestable vices.
Thou hast defiled my sanctuary will all thy detestable things, and
with all thine abominations. Ezek. v. 11.
Syn.
– Abominable; odious; execrable; abhorred.
Source: Webster’s Unabridged Dictionary 1913 Edition