abysmally
Definitions
In a very bad or appalling manner.
To an extreme or profound degree, typically used to emphasize a negative quality.
Examples
The team performed abysmally during the first half of the championship game.
The company's customer service was abysmally slow, leaving many clients frustrated.
Synonyms
terribly dreadfully atrociously woefully appallingly horribly miserably
Antonyms
excellently superbly admirably wonderfully splendidly brilliantly exceptionally