As adjectives the difference between gaudy and trinkety
is that gaudy
is very showy or ornamented, now especially when excessive, or in a tasteless or vulgar manner while trinkety
is (informal) resembling or characteristic of a trinket; gaudy and worthless.
As a noun gaudy
is one of the large beads in the rosary at which the paternoster is recited or gaudy
can be a reunion held by one of the colleges of the university of oxford for alumni, normally held during the summer vacations.