The adjective dubious means incompletely true or untrusted thought.

Synonyms are fishy, questionable, suspicious, or shady.

The word origins from late Latin (1540s) dubiosus meaning “doubtful”, from duo meaning “two” with a sense of “of two minds, undecided between two things.” In Old English, it is also used as tweo meaning “two” to mean “doubt”.

It’s morally dubious to use cluster bombs.

Many heightened issues certainly sound dubious.

IP address request seems dubious in any event.