アンダー

Frequency rank: 22,140. – 22,272.

noun or verb acting prenominally

This meaning refers to something being below a certain standard or expectation, often used to describe performance or quality.

His presentation was under par.

noun (common) (futsuumeishi)

This meaning specifically addresses insufficient exposure or development in various contexts, such as photography or growth.

This photo has underexposure and is too dark to see.