This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

Not trusty; not worthy of confidence; unfaithful.

adj. not worthy of trust or belief

"Holding my rather untrusty camera in my hand ready for action, I began with some photos as the train crossed the Forth on the old rail bridge."

devious    fly-by-night    shifty    tricky    shady