Does "lesser" as in "lesser man" refer only to moral strength and goodness or can it encompass physical and mental stamina?
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NOAD gives the meanings thus:
But that doesn't tell the whole story. The term "lesser" may refer to someone who is not as great as another by any measure one chooses.
Would be more useful to see it in a full sentence, but what seems clear is that it would refer to the particular subject of conversation (stamina, mental power, bravery, etc)
Saying that, I would use 'less of a man'