Is Ostentatiously an Adjective or Adverb?

ostentatiously adverb - Definition, pictures, pronunciation and usage notes | Oxford Advanced Learner's Dictionary at OxfordLearnersDictionaries.com.

What is a ostentatiously?

: attracting or seeking to attract attention, admiration, or envy often by gaudiness or obviousness : overly elaborate or conspicuous : characterized by, fond of, or evincing ostentation an ostentatious display of wealth/knowledge The power of the government was present …

Is Ostentatiousness a word?

cut a swath To show off or attract attention to one-self; to make a pretentious display; to cut a dash.