fickleness vs faithlessness

fickleness and faithlessness both are nouns.

Word	Noun	Adjective	Verb	Adverb
fickleness	Yes	No	No	No
faithlessness	Yes	No	No	No

As nouns, fickleness and faithlessness are synonyms defined as:

fickleness and faithlessness: unfaithfulness by virtue of being unreliable or treacherous

Other synonyms of fickleness include falseness, inconstancy.

fickleness (noun)	faithlessness (noun)
unfaithfulness by virtue of being unreliable or treacherous	unfaithfulness by virtue of being unreliable or treacherous