'misjudgment' originates from English, specifically formed from the prefix 'mis-' (from Old English 'mis-' meaning 'wrongly') and the word 'judgment' (from Anglo-French/French 'jugement', ultimately from Latin 'judicium' where 'judicium' meant 'a judgment, decision').

'misjudgment' developed by attaching the negative prefix 'mis-' to 'judgment'. 'Judgment' came into Middle English via Anglo-French 'jugement' from Latin 'judicium'; over time the components combined in Modern English to form 'misjudgment'.

Initially, the elements meant 'wrongly' + 'a decision or evaluation'; over time the combined form has retained that original sense, referring to a wrong or faulty judgment.