allege-- report or maintain; "I allege that he was the victim of a crime"
arrant--without qualification; "An arrant fool is useless."
badinage--Badinage is light, teasing banter. This noun refers to playful remarks or conversations that are not serious.
conciliate--pacify: cause to be more favorably inclined; gain the good will of; "She managed to conciliate the angry customer."
countermand--revoke: cancel officially; "I countermand the ban on smoking";
echelon--An echelon formation is a military formation in which members are arranged diagonally.
exacerbate--To make worse. For example, smoking may exacerbate systemic lupus erythematosus.
fatuous--devoid of intelligence "the crowd laughed at the fatuous clown."
irrefutable--incontrovertible: impossible to deny or disprove; "There was irrefutable proof of the defendant's innocence."