Word: fastly
Part of speech: Adverb
Syllables: fast
ly
Definition: securely; fast
Morphemes:
Affix: fast
Language: en
PoS: Adverb
Meaning: In a firm or secure manner, securely; in such a way as not to be moved; safe, sound .
Affix: -ly
Language: en
PoS: Suffix
Meaning: Used to form adverbs from adjectives.