This is an unofficial meeting.

His behavior is illogical and incomprehensible.

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

The war crime was condemned as inhumane by the international community.

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

This design has a unique charm because it is asymmetrical.

I'm troubled by his unproductive attitude.

Amorphous substances have characteristics different from crystals.

His glasses are for correcting astigmatism.

That theory is unscientific and has no evidence at all.