"Not straight" is a phrase used to describe anything that is not in a straight line or doesn't follow a traditional path. There are many synonyms that can be used in place of this phrase including crooked, irregular, bent, skewed, winding, twisting, meandering, curving and jagged. These are all great words to use when describing anything from a road to a river, or even a person's characteristics. They can also be used to describe a situation, such as a crooked deal or a twisted truth. These synonyms can help to add variety to your writing style and make your descriptions more interesting and engaging for readers.