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.
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
the opposite of straight is crooked or wavy.
The opposite of crooked is straight.
The opposite is straight.
I suppose the opposite of gay would be heterosexual ("straight")
heterosexual (straight)
A straight guy is someone who likes the opposite sex.
Straight
Gay.
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.
Oh honey, an angle formed by opposite rays is a straight angle. It's like a perfectly straight line, no curves or funny business. So if you see those opposite rays coming together, you better believe they're forming a straight angle, no ifs, ands, or buts about it.
Straight.
The opposite of vibrato in music is called straight tone.