adj 1 that cannot be explained or accounted for 无法解释的; 难以说明的: an unaccountable increase in cot deaths, ie of babies 难以解释的婴儿猝死数量上升的现象 * For some unaccountable reason, the letter never arrived. 不知何故, 那封信始终未收到. 2 ~ (to sb/sth) (fml 文) not answerable for one's actions, etc; not accountable （对自己的行为等）不必负责任的, 无责任的.
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