The opposite of straight could be crooked, curved, turned, or bent.
The opposite of straight (honest) could be dishonest, devious, or corrupt.
The opposite of straight (slang for heterosexual) would be gay.
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Curve is one possible opposite of straight if straight refers to line that does not bend. Other meanings of straight like honest, heterosexual, and direct have different opposites than curve.
The opposite is perpendicular (a straight line that hits another at a right angle).
Antonym means the opposite. So the opposite of angle is a straight line.
The word straight does have an antonym, which is crooked. So perhaps a crooked line is the opposite of a straight line.
It is a diagonal