justlyEnglishOxford English Thesaurusjustly adverb 1 a man who is justly proud of his achievement: justifiably, with reason, with good reason, legitimately, rightly, rightfully, properly, deservedly, by rights. ▷antonyms unjustifiably. 2 they deserve to be treated justly: fairly, with fairness, equitably, even-handedly, impartially, without bias, objectively, without prejudice, without fear or favour; by the book, in accordance with the rules; informal fairly and squarely. ▷antonyms unjustly.justly Oxford Dictionary of English