interestingness [...] gordeousity

Isn't the second one supposed to be gorgeosity? English gorgeous from the French, is ultimately from the word gorge 'throat' (cf. gorget 'a piece of armor, originally to protect the throat'). The latter word might be (ultimately) from Latin gurges 'whirlpool, abyss'. Interestingness does sound a little strange, but it's probably a matter of its being so new; cf. unwillingness and a host of others (link).

Ceci n'est pas un seing.