unreliable vs temperamental

unreliable and temperamental both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unreliable	No	Yes	No	No
temperamental	No	Yes	No	No

unreliable (adjective)	temperamental (adjective)
not worthy of reliance or trust	relating to or caused by temperament
dangerously unstable and unpredictable	subject to sharply varying moods
liable to be erroneous or misleading	likely to perform unpredictably
lacking a sense of responsibility