Fiddled with means to make small, unnecessary movements or adjustments to something. Antonyms for fiddled with include fixing, repairing, or adjusting appropriately. Instead of aimlessly playing with something, one could carefully examine and fix the issue at hand. Similarly, instead of needlessly moving items around, one could tidy up and organize them. Antonyms for fiddled with also include leaving something alone or being content with the way things are. In order to avoid causing any damages, it is important to avoid fiddling with things and instead, properly address any issues that may occur.