You took every precaution, but we're up against a diabolically clever enemy.

It's a cinch we're up against a clever and highly scientific enemy.

That man was one of his cleverest enemies.

What would be the point of cyphering messages that very clever enemies couldn't break?

How can I guard against the clever enemy, sensei?

The Emperor is a very clever and dangerous enemy.

What if the pollution were caused at long range by a clever enemy?

Making dumb mistakes which, if they were made in combat, would lead to gaps that a clever enemy could exploit.

There were signs of a ruthless, clever enemy behind all of this.

Molydei are strong and clever enemies, feared also by other demons.