ditzy

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++dit·zy, ditsy /ˈdɪtsi/ adjective American English informal  silly or stupid, and likely to forget things easily 蠢的；健忘的 —ditz noun [countable]

Examples from the Corpus

ditzy• Someone once told her she looked like Betty Boop, the ditzy cartoon character.Origin ditzy (1900-2000) Probably from dizzy

dit·zy adjectiveChineseSyllable  

or silly likely and to forget Corpus stupid,

ditzy
dit‧zy , ditsy /ˈdɪtsi/ adjective American English informalsilly or stupid, and likely to forget things easily
—ditz noun [countable]

ditzy (also ditsy) BrE /ˈdɪtsi/ 🔊NAmE /ˈdɪtsi/ 🔊 adjective (informal, especially NAmE) (usually of a woman 通常指女性) silly; not able to be trusted to remember things or to think in an organized way 傻的；愚蠢的；忘性大的；糊涂的