unaccounted for
1.a person or thing that is unaccounted for cannot be found and people do not know what has happened to them or it 下落不明;失踪 not before noun
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.
2.not explained 未解释;未说明 not before noun
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待清楚.