n. One who impugns; one who opposes or contradicts.
the GNU version of the Collaborative International Dictionary of English
n. One who impugns.
The Century Dictionary and Cyclopedia
n. One who impugns; one who opposes or contradicts.
Word Usage
"Under that is the hater, the impugner of motives … this is the contemptuous, contemptible layer that stimulated him to engage ‘plumbers’ to plug news leaks and to trample civil liberties in what he saw as a higher cause…."