the word 'unjust' is formed by the straightforward combination of the negative prefix 'un-' and the adjective 'just'. the root 'just' originates from latin iustus, meaning 'righteous' or 'lawful', which itself derives from ius, signifying 'law' or 'right'. the prefix 'un-', with its old english and ultimately proto-germanic ancestry, is one of the most common and productive means of forming negation in english. therefore, the literal construction 'not just' or 'not fair' has remained semantically transparent from its formation to its modern abstract meaning describing actions or situations that violate principles of fairness and morality.

Structure: un (not) + just (fair) un- (a prefix of Germanic origin, from old english, indicating negation or reversal). just (from latin iustus, meaning 'righteous, equitable', from ius meaning 'law, right').