treacherous vs unreliable

treacherous and unreliable both are adjectives.

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

As adjectives, treacherous and unreliable are synonyms defined as:

treacherous (adjective)	unreliable (adjective)
dangerously unstable and unpredictable	not worthy of reliance or trust
tending to betray; especially having a treacherous character as attributed to the Carthaginians by the Romans	dangerously unstable and unpredictable
	liable to be erroneous or misleading
	lacking a sense of responsibility