Dubious (Adj) causing uncertainty or suspension; in a doubtful or uncertain state of mind (S) questionable, suspect, unsettled, undecided (A) certain, positive, indubitable, reliable
Impenitent (Adj) not feeling remorse or sorrow for errors or offenses (S) remorseless, unrepentant, incorrigible (A) ashamed, remorseful, on trite, apologetic
Probe (V) to examine, investigate thoroughly; (n) an investigation, a device used to explore or examine (S) explore, inquiry, detector (A) hide, cover up, whitewash