bubblehead

== English == === Etymology === From bubble +‎ head. (diver): Inspired by the shape of the old spun-copper diving helmet. === Pronunciation === === Noun === bubblehead (plural bubbleheads) (slang) A stupid person. (slang) A submariner; bubble-head. (slang) A navy hard hat or salvage diver. ==== Synonyms ==== (stupid person): airhead