Wiktionary
n. An incorrect match or pairing; a mismatch. vb. (present participle of mismatch English)
Usage examples of "mismatching".
Then she gathered the papers where they had fallen out of piles, re-piled, exposing more of the mismatching colors of the thick rugs.
Now that it was his office it was crammed with bookshelves and piles of pillows and stacks of paper over layers of mismatching rugs, very much like the old office.
It looked to be old armor cobbled together from mismatching outfits borrowed from other knights.
They were dressed in clothes only slightly better than rags, with an oddly mismatching assortment of armor and weapons.
He carried a sword at his side, and his hands were cladin mismatching gloves.
Although blind since birth, therefore incapable of distinguishing between matching and mismatching shades, Henry never errs.