Word: stiffly
Part of speech: Adverb
Syllables: stiff
ly
Definition: In a stiff manner; having a strong physiological or chemical effect; 
Morphemes:
Affix: stiff
Language: en
PoS: Adjective
Meaning: Inflexible; rigid.
Affix: -ly
Language: en
PoS: Suffix
Meaning: Used to form adverbs from adjectives.