This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

ad. In a just or fair manner; rightfully.

ad. With a just or fair use of language; with good reason, properly.

ad. With great precision; accurately, exactly.

ad. In a just manner; in conformity to law, justice, or propriety; by right; honestly; fairly; accurately.

In a just manner; in conformity to reason, law, or justice; by right; honestly; fairly; equitably: as, to deal justly; an opinion justly formed.

In conformity to fact or rule; accurately: as, his character is justly described.

ad. with honesty

ad. in accordance with moral or social standards

"In which censure I think I am no tyrant, which the philosopher names the worst of wild beasts; I am sure I am no flatterer, which he calls justly, the worst of tame beasts, — Kai tauta men dē tauta."

honestly    fairly    accurately   

robustly    unjustly