The phrase "a plausible man" is correct and usable in written English.
It can be used to describe a man who seems reasonable or believable in a particular context.
Example: "In the debate, he presented himself as a plausible man, making it difficult for the audience to dismiss his arguments."
Alternatives: "a credible man" or "a reasonable man".
He seems a decent and plausible man, but once you get past Recoing's welcoming smile you enter a realm of mystery — the oddities lodged in the hollows of Vincent's good will.
After leaving office, in 1877, he moved to New York, eager to make his fortune, and got swindled by a plausible con man, losing all the money he had made.
Harris discovers that he has been replaced at the conference and in his marriage by a plausible-seeming man who also calls himself Martin Harris Aidan Quinnn), and, further, that his wife doesn't seem to know him.
Dr Hildegard Wolf, an idiosyncratic therapist working in Paris, is approached by two plausible men claiming to be the murderous toff - a fugitive from justice now officially dead in his homeland.
Lew Cody is acceptable as the insincere but plausible man-about-town.
To be a plausible amateur a man must be independently well-to-do.
He bowled very nicely, showing deceptive variations and some decent spin, and with his runs was a plausible candidate for man of the match.
But who was he? 'He's a very plausible con man,' said the distinguished Professor Lawson-Young, head of a top medical institute.
Playing the onetime star of the very British, very ramshackle The Amazing Lollipop Man, McCoy brought a plausible, lived-in fragility to a man struggling to come to terms with the world of DVD commentaries and convention appearances, while also guaranteeing that this particular Doctors episode would be spotlighted on sci-fi blogs across the galaxy.
This leaves Parini in a contest with Melville's published prose as he attempts to conjure a plausible version of a man Hart Crane called a "fabulous shadow".
