obviousness
Concise Oxford English Dictionary © 2008 Oxford University Press:
obvious/ˈɒbviəs/
▶adjective
- 1 easily perceived or understood; clear.
- 2 derogatory predictable and lacking in subtlety.
– derivatives
obviously adverb,
obviousness noun.
obviously adverb,
obviousness noun.
– origin C16 (in the sense ‘frequently encountered’): from L. obvius (from the phr. ob viam ‘in the way’) + -ous.
'obviousness' also found in these Oxford entries:

