parallel
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Actually, all lines are straight and endless. A ray has one endpoint, is straight, and the other end of the ray is endless. A segment has a defined beginning and end, and is straight.
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Line
Yes. If it is not straight, then it is not a line.
it just a straight line
If it is not straight, then it is not a line.
The word straight does have an antonym, which is crooked. So perhaps a crooked line is the opposite of a straight line.