just has 16 distinct synonyms spread across 9 of its 12 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is unjust.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
used especially of what is legally or ethically right or proper or fitting
“a just and lasting peace”
fair to all parties as dictated by reason and conscience
“equitable treatment of all citizens”
free from favoritism or self-interest or bias or deception; conforming with established standards or rules
“a fair referee”
2 of the 12 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for just.
Synonyms, antonyms and the broader and narrower relations for just come from Princeton University’s WordNet. Full sources and licences.