noun, noun or participle which takes 'suru', intransitive verb
failure to recognize someone; forgetting a face
Refers to the situation where one cannot remember or recognize a person's face, often after a long time or a brief encounter. Can be used as a noun or with する to describe the act of failing to recognize someone.
久しぶりに会った同級生に面忘れされてしまった。
A classmate I hadn't seen in a long time failed to recognize me.
一度
Sometimes you may fail to recognize someone you've only met once.