Word: terribly
Part of speech: Adverb
Syllables: ter
ri
bly
Definition: Very; extremely.
Morphemes:
Affix: terrible
Language: en
PoS: Adverb
Meaning: In a terrible way; to a terrible extent; terribly; awfully.
Etymology Compounds: Affix: terreō
Language: la
Decoded: terreo
Meaning: I frighten, terrify, alarm; I deter by terror, scare 
Affix: -ibilis
Language: la
Decoded: -ibilis
PoS: Suffix
Meaning: -able; able or worthy to be (the recipient of an action).
Affix: -ly
Language: en
PoS: Suffix
Meaning: Used to form adverbs from adjectives.