un·ac·count·a·ble/ˏʌnə`kantəbḷ; ˌʌnəˈkaʊntəbəl◄/ adj 1 not having to explain your actions or decisions to anyone else 〔对自己的行为或决定〕不用解释的，不用负责任的 2 very surprising and difficult to explain 莫名其妙的; 无法解释的: For some unaccountable reason he's moving to New York. 出于某种无法解释的理由，他即将搬到纽约去。