No, it's an adjective. The adverb form is terribly.
Terribly...
extremely
The Greek word "deinos" translates to "terrible" or "fearful" in English. It can also be interpreted as "formidable" or "wondrous" depending on the context in which it is used.
3. terr-ibb-ly
There are two adverbs in that sentence: "outdoors" and "terribly". "Outdoors" modifies the verb "go" and "terribly" modifies the adjective "cold".
undecide ( no such word im terribly sorry)
That is such a terrible thing to say.I had a terrible time thinking of this sentence.Ivan the Terrible was a truly awful person.The food tasted terrible.
Alliteration for toast
grim eerie fearful horrid unpleasant FIND MORE ON THERSAURUS.COM ON DICTIONARY.COM
Get a shroud rapidly to me, please, I am feeling terribly cold.
The correct spelling of the word is atrocious(awful).