un.ac.count.a.bly H.Qn7E5kaJn7tE7bli, $-tE- adv 无法解释地，难以说明地，莫名其妙地 I felt unaccountably happy this morning as I left the house. 今上午当我离开家时我感到莫名其妙地高兴。 I'm looking for my pen which unaccountably vanished from my desk overnight. 我在寻找我的钢笔, 一夜间它莫名其妙地从我的课桌里消失了。