horriblement

/ɔ.ʁiblə.mɑ̃/
1.
adverb

extremely

very (intensifier)

C'était horriblement long, j'ai cru que ça n'allait jamais finir.

It was horribly long; I thought it was never going to end.

2.
adverb

in a horrible way

badly

awfully

Il chante horriblement mal.

He sings horribly / very badly.