The word 'unjustified' refers to something lacking in reason or justification. Synonyms for the term include unwarranted, baseless, groundless, and unfounded. All these terms connote an absence of supporting evidence or rational thought, implying a lack of legitimacy or credibility in the situation. Other possible synonyms for 'unjustified' include disproportionate, excessive, and undue, referring to an overreaction or disproportionate response. Irresponsible, improper, and unwise can also describe behavior that lacks justification due to a lack of foresight, attention, or responsibility. Finding the right synonym for 'unjustified' can add precision or emphasis to descriptions of actions or situations that lack justification or logic.