fickle vs inconstant

fickle and inconstant both are adjectives.

Word	Noun	Adjective	Verb	Adverb
fickle	No	Yes	No	No
inconstant	No	Yes	No	No

fickle (adjective)	inconstant (adjective)
liable to sudden unpredictable change	likely to change frequently often without apparent or cogent reason; variable
marked by erratic changeableness in affections or attachments