Word: darnedest
Part of speech: Noun
Syllables: darned
est
Definition: Damnedest; one's best effort.
Morphemes:
Affix: darn
Language: en
PoS: Adjective
Meaning: Damn.
Affix: -ed
Language: en
PoS: Suffix
Meaning: As an extension of the above, when used along with an adjective preceding the noun, describes something that has an object of a particular quality.
Affix: -est
Language: en
PoS: Suffix
Meaning: Used to form the superlative of adjectives and adverbs.