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

I should, of course, have been feeling greatly relieved by the turn of events, and diabolically clever to boot.

I should be satisfied with my own company, shouldn't I, a diabolically clever guy like me?

The ability to manipulate the system for rip-off seemed diabolically clever.

The word connotes a diabolically clever move or combination that turns the tables on the opponent.

We don't know that he isn't diabolically clever.

Set out badly like this, it may not seem diabolically clever.

It is diabolically clever; exactly what I would expect from them.

It was a diabolically clever lie, the perfect way to entrench himself in her bedchamber.

Instead, a diabolically clever man who'd played a two-sided game against Cassandra and my son.