wily

This virus is incredibly wily, it’s spreading out of control and front-line workers are exhausted.

With the new coronavirus, we’re in the early stages of the learning process, even though it often feels like we’ve been waiting forever to figure out this particularly wily foe.

I supply a line which, at any rate, rimes; went his wyle means 'turns aside his wiliness.'

Must there not be experience on the part of dogs to contend successfully with such wiliness as this?