Depends. Probably not because nothing is perfect! :)
i have to disagree - the sides of crystals are straight
~
*Sigh*
All lines are straight. A man-made one may not be, but by the correct definition, all lines are straight. Straight lines are a mathematical concept - an ideal concept - and therefore, conceptually, all lines are straight even if man-made ones are mere approximations.
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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 length (distance) of a straight line always changes, the angle of a straight line is 180 degrees.
The word straight does have an antonym, which is crooked. So perhaps a crooked line is the opposite of a straight line.