List of undiplomatic synonyms and undiplomatic related words.
airy, brash, careless, casual, cursory, degage, disregardant, disregardful, easygoing, flippant, forgetful, free and easy, heedless, impolitic, inconsiderate, indifferent, insouciant, lazy, maladroit, oblivious, offhand, perfunctory, reckless, regardless, respectless, tactless, thoughtless, unheedful, unheeding, unmindful, unprepared, unready, unsolicitous, untactful, unthinking