Ostentatious vs Superfluous - What's the difference?

As adjectives the difference between ostentatious and superfluous

is that ostentatious is of ostentation while superfluous is in excess of what is required or sufficient.

(en adjective)

Of ostentation.

Intended to attract notice.

Of tawdry display; kitsch.

* (tawdry)

* ostensible * ostensive

* * *

(-)

In excess of what is required or sufficient.

With a full rain suit, carrying an umbrella may be superfluous .

* excessive, extraneous, extra, pleonastic, supernumerary, surplus, unnecessary, extravagant

* gratuitous