frivolousness
Concise Oxford English Dictionary © 2008 Oxford University Press:
frivolous/ˈfrɪvələs/
▶adjective not having any serious purpose or value.
■ (of a person) carefree and superficial.
– derivatives
frivolity noun,
frivolously adverb,
frivolousness noun.
frivolity noun,
frivolously adverb,
frivolousness noun.
'frivolousness' also found in these Oxford entries:

