Word Study
assuming
CIDE DICTIONARY
assuming, a.
Pretentious; taking much upon one's self; presumptuous. Burke. [1913 Webster]
OXFORD DICTIONARY
assuming, adj. (of a person) taking too much for granted; arrogant, presumptuous.
ROGET THESAURUS
assuming
Insolence
N insolence, haughtiness, arrogance, airs, overbearance, domineering, tyranny, impertinence, sauciness, flippancy, dicacity, petulance, procacity, bluster, swagger, swaggering, bounce, terrorism, assumption, presumption, beggar on horseback, usurpation, impudence, assurance, audacity, hardihood, front, face, brass, shamelessness, effrontery, hardened front, face of brass, assumption of infallibility, saucebox, insolent, haughty, arrogant, imperious, magisterial, dictatorial, arbitrary, high-handed, high and mighty, contumelious, supercilious, overbearing, intolerant, domineering, overweening, high-flown, flippant, pert, fresh, cavalier, saucy, forward, impertinent, malapert, precocious, assuming, would-be, bumptious, bluff, brazen, shameless, aweless, unblushlng, unabashed, brazen, boldfaced-, barefaced-, brazen-faced, dead to shame, lost to shame, impudent, audacious, presumptuous, free and easy, devil-may-care, rollicking, jaunty, janty, roistering, blustering, hectoring, swaggering, vaporing, thrasonic, fire eating, full of sound and fury, with a high hand, ex cathedra, one's bark being worse than his bite, beggars mounted run their horse to death, quid times? Caesarem vehis, wagahai wa (expressing superiority).For further exploring for "assuming" in Webster Dictionary Online