Webster's Revised Unabridged Dictionary · 1913

Justly

Justly , adverb

[From Just, a.]

In a just manner; in conformity to law, justice, or propriety; by right; honestly; fairly; accurately.
In equal balance justly weighed. — Shakespeare
Nothing can justly be despised that can not justly be blamed: where there is no choice there can be no blame. — South