1) Abysmally 2) Atrociously 3) Awfully 4) Desperately 5) Disastrously 6) Disgracefully 7) Dreadfully 8) Frightfully 9) Indescribably 10) Rottenly 11) Tremendously 12) Very 1) Appallingly 2) Atrociously 3) Awful 4) Awfully 5) Awfully, frightfully 6) Badly 7) Completely 8) Desperately 9) Dreadfully 10) Ever so 11) Extremely 12) Extremely badly 13) Fearfully 14) Frightfully 15) Hideously 16) Horrendously 17) Horribly 18) Horrifically 19) How brats behave 20) In a terrible manner 
[adv] - in a terrible manner 2. [adv] - (informal) used as intensifiers, as in`terribly interesting`
terribly 1. In a terrible manner. 2. Informal: Extremely; very: 'It's terribly late and I'm terribly sorry, but you will have to go now.' 3. To a great extent; very much: 'Would you mind terribly if we go home now?
awfully 2 abominably adverb in a terrible manner; `she sings terribly`awfully adverb used as intensifiers; `terribly interesting`; `I`m awful sorry`