There are several synonyms that can be used instead of "were slanted." Such as, inclined, angled, tilted, sloped, skewed, canted, leaning, listing, and oblique. All of these words can be used in different contexts to convey the same idea as "were slanted." For example, if someone says, "The picture was hanging on the wall, but it looked as if it was inclined to the left," the meaning is the same as "the picture was slanted to the left." These synonyms can be used creatively to add variety and depth to writing, making it more engaging and enjoyable to read.