頭でっかち あたまでっかち Meanings な-adjective, の-adjective, Noun top-heavy big-headed overly-theoretical Kanji 頭 head. Read as あたま. Example sentences うちの会社は頭でっかちだ。Our company is too top-heavy. 頭でっかちの人ね、ちょっぴりめんどくさそうだけど別に嫌いじゃないよ。I find overthinkers to be a little hard to deal with but I don't hate them so to say. Jinuma: Japanese Dictionary · Word lists