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Definition of undue : 1. Not agreeable to a rule or standard, or to duty; disproportioned; excessive; immoderate; inordinate; as, an undue attachment to forms; an undue rigor in the execution of law.
2. Not due; not yet owing; as, an undue debt, note, or bond.
3. Not right; not lawful or legal; improper; as, an undue proceeding.

Synonyms:

overweening, indefensible, intolerable, insupportable, overmuch, wild, excess, insane, towering, plethoric, unconscionable, overabundant, unwarranted, excessive, overly, overdue, unjustifiable, idle, inordinate, more, steep, over, exuberant, surplus, unwarrantable, unfounded, lavish, devilish, extravagant, unmerciful, groundless, baroque, not due, fancy, unjustified, exorbitant, too, hyper-, stiff, exceptional, unreasonable, overextravagant, immoderate, baseless, beyond

improper (part of speech: adjective)

extreme, unjust, indecorous, un, mly, sinister, unnecessary, underhanded, too great, unfair, disproportionate, forbidden, illegal

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