unaccounted
adj. 未说明解释的；未包括在某数目中的；行踪不明的
例句
At least 300 civilians are unaccounted for after the bombing raids.
遭轰炸袭击之后，至少有300名平民下落不明。
《牛津词典》
In the story he gave the police, half an hour was left unaccounted for.
他对警察的陈述中有半个小时的事情未交代清楚。
5,000 American servicemen who fought in Korea are still unaccounted for.
5000名曾在朝鲜打仗的美国军人仍下落不明。
《柯林斯英汉双解大词典》
