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imprecation curse; swearword impregnable invulnerable; impossible to capture or enter by force; Ex. impregnable fort/argument; CF. take impregnate make pregnant; fill thoroughly; saturate impromptu without previous preparation; off the cuff; on the spur of the moment impropriety improperness; unsuitableness improvident thriftless; not providing for the future improvise compose on the spur of the moment imprudent lacking caution; not prudent; injudicious impudence impertinence; insolence impugn dispute or contradict ; attack as false or questionable; challenge; gainsay; CF. fight impuissance powerlessness; feebleness impunity freedom from punishment or harm; CF. punish impute attribute; ascribe; charge; N. imputation inadvertently unintentionally; by oversight; carelessly inalienable not to be taken away; nontransferable; Ex. inalienable rights | 
