"Thingumadoodle" is a whimsical word often used to represent an object whose name may be unknown or forgotten. There are several synonyms to this word that give a little more specificity to the object in question. Some of the most common ones include gadget, gizmo, widget, and doohickey. Other similar words that can fit in the same context include knickknack, trinket, tchotchke, and bauble. These words may be used interchangeably with thingumadoodle but provide a more accurate description of the object in question. Whether it be a mechanical device or a small decorative item, these synonyms can come in handy when searching for the right word to describe any curious object.