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os‧ten‧ta‧tious

1 something that is ostentatious looks very expensive and is designed to make people think that its owner must be very rich :
She carried her car keys on an ostentatious gold key ring.
an ostentatious display of wealth
She carried her car keys on an ostentatious gold key ring.
an ostentatious display of wealth2 someone who is ostentatious likes to show everyone how rich they are :
He was vain and ostentatious.
He was vain and ostentatious. —ostentatiously adverb
