He was called an unpatriotic person because of his actions.

She publicly acknowledged that she is asexual.

This is an unofficial meeting.

The problem of illiteracy is a serious social issue around the world.

His behavior is illogical and incomprehensible.

His behavior was illogical and I couldn't understand it.

This problem requires solving a nonlinear equation.

This sentence contains kanji not approved for regular use.

There were water striders floating on the pond.

The hippopotamus is a very rare animal.