under-employment (n.) under-employed (adj.) under-achiever (n.) under (prep., adv.) under prep. 在……下面；在……表面下；在……的后面；（職務(wù)、級別）低于；少于；比……年輕；由……控制；根據(jù)；在……過程中；受……影響；承受著；以（某一名字）；在……項下；在（某個系統(tǒng)）下；在……期間；在……生存條件下；栽有；在……掌權(quán)期間；在……手下工作 adv. 在下面；在水下；少于；較年輕；在昏迷中； adj. 較低的；下面的undeniable (adj.) undemonstrative (adj.) undemanding (adj.) undelivered (adj.) undefined (adj.) undefinable (adj.) undefiled (adj.) undefended (adj.) undefeated (adj.) undecisive (adj.) undecipherable (adj.) undecided (adj.) undecennial (adj.) undeceived (adj.) undeceive (v.)