just

1. Honorable and fair in one's dealings and actions: a just ruler. See synonyms at fair¹.
2. Consistent with what is morally right; righteous: a just cause.
3. Properly due or merited: just deserts.
4. Law. Valid within the law; lawful: just claims.
5. Suitable or proper in nature; fitting: a just touch of solemnity.
6. Based on fact or sound reason; well-founded: a just appraisal.

1. Precisely; exactly: just enough salt.
2. Only a moment ago: He just arrived.
3. By a narrow margin; barely: just missed being hit; just caught the bus before it pulled away.
4. At a little distance: just down the road.
5. Merely; only: just a scratch.
6. Simply; certainly: It's just beautiful!
7. Perhaps; possibly: I just may go.

just about

1. Almost; very nearly: This job is just about done.

1. Only a moment ago.

1. Nevertheless.

[Middle English juste, from Old French, from Latin iūstus.]