Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun thingummy
1 sense of thingummy
Sense 1
doodad, doohickey, doojigger, gimmick, gizmo, gismo, gubbins, thingamabob, thingumabob, thingmabob, thingamajig, thingumajig, thingmajig, thingummy, whatchamacallit, whatchamacallum, whatsis, widget -- (something unspecified whose name is either forgotten or not known; "she eased the ball-shaped doodad back into its socket"; "there may be some great new gizmo around the corner that you will want to use")
=> stuff -- (miscellaneous unspecified objects; "the trunk was full of stuff")