Grandiosity is a characteristic of being so ambitious or extravagant that you seem pretentious. The grandiosity of that new house down the street, with all of its turrets and columns, is a little ridiculous.

Someone's grandiosity might come across in the way they brag about their amazing achievements, blowing them up to be even bigger — or more grand — than they actually are. Or you might betray your grandiosity by making outlandish plans that don't seem quite realistic: "Later, I realized the grandiosity of my idea to start a cookie business that would make a million dollars in the first six months." The Latin root is grandis, "big."

Definitions of grandiosity
  1. noun
    high-flown style; excessive use of verbal ornamentation
    “the grandiosity of his prose”
    synonyms: grandiloquence, magniloquence, ornateness, rhetoric
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    a display of ornamental speech or language
    blah, bombast, claptrap, fustian, rant
    pompous or pretentious talk or writing
    type of:
    expressive style, style
    a way of expressing something (in language or art or music etc.) that is characteristic of a particular person or group of people or period
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