Sentence:  Evasive, womanising, boastful, malicious, untrustworthy, an inveterate gambler who combined his mediocre military career with running a high-class brothel, permanently cash strapped and viciously quarrelsome, his character is as <WSD>dubious</WSD> as his unsavoury appearance. 
Meaning of the word marked with <WSD> tags:  Arousing doubt; questionable; open to suspicion.