Gaudy is a related term of gaudful.
In obsolete|lang=en terms the difference between gaudy and gaudful
is that
gaudy is (obsolete) gay; merry; festive while
gaudful is (obsolete) joyful; showy.
As adjectives the difference between gaudy and gaudful
is that
gaudy is very showy or ornamented, now especially when excessive, or in a tasteless or vulgar manner while
gaudful is (obsolete) joyful; showy.
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.