i-adjective
unpopular; not well-liked; unattractive
Describes someone who is not popular, especially in romantic or social contexts. Often used self-deprecatingly or humorously. The glosses 'nerdish' and 'unwelcome' are less common translations; the core meaning is lack of popularity or appeal.
彼は全然モテない。
He's not popular at all.
モテない自分を変えたい。
I want to change my unpopular self.