Sternly vs Strictly - What's the difference?

As adverbs the difference between sternly and strictly

is that sternly is in a stern manner while strictly is in a strict manner.

(en adverb)

In a stern manner.

(en-adv)

In a strict manner.

He adhered strictly to the diet his doctor prescribed.

In a limited manner; only

This work was strictly voluntary, but any animal who absented himself from it would have his rations reduced by half.

In a narrow or limited sense.

That term refers strictly to smaller birds.