terriblemente
/teˌribleˈmente/ · B1 · adv
terribly
😱 terrible + mente = in a terrible way; -mente works like English -ly
Spanish adds -mente to an adjective to turn it into an adverb, the same job English -ly does. It comes from Latin mens, mind, so the word literally means with a terrible mind. Watch the stress: it falls on MEN, not on the start of terrible.