adv.难以解释地，莫名其妙地，无明显原因地

His sudden disappearance was unaccountably strange.
他的突然失踪无比蹊跷。
The company's financial loss for this quarter is unaccountably high.
公司本季度的财务损失出奇地高。
Her behavior at the party was unaccountably awkward.
她在聚会上的行为莫名尴尬。
Despite his extensive practice, he performed unaccountably poorly in the competition.
尽管他进行了大量的练习，但他在比赛中表现得莫名其妙地差。
The sudden drop in temperature was unaccountably severe.
气温骤降的程度令人费解。
His reaction to the news was unaccountably calm.
他对这个消息的反应出奇地冷静。
The plant's growth has been unaccountably slow this season.
这季植物生长的速度令人难以解释地慢。
She turned down the job offer unaccountably, despite its excellent conditions.
她莫名其妙地拒绝了那份条件极好的工作邀请。
The customer's complaint about the product was unaccountably vague.
顾客对产品的投诉内容模糊不清，令人不解。
The athlete's sudden retirement from sports was unaccountably abrupt.
这位运动员突然宣布退役，原因不明。