Smithereens refer to small pieces of broken something. Some competent antonyms for Smithereens are "intact", "complete", "whole", "together", "in one piece", "undamaged", "unbroken", "unscathed", "uninjured", and "perfect". These antonyms are opposites of the word Smithereens as they indicate something that is unbroken and complete, unlike Smithereens which mean the thing has been destroyed or shattered into tiny pieces. These antonyms are often used to describe objects or situations that are not damaged or broken, and can be used in various contexts like repairing an old car, protecting delicate items during transportation, etc.