Entry 1 sense Webster, 1913 Inunctuosity · In·unc·tu·os·i·ty · IPA 01 n. The lack of unctuosity; freedom from greasiness or oiliness; as, the inunctuosity of porcelain clay. 1. The lack of unctuosity; freedom from greasiness or oiliness; as, the inunctuosity of porcelain clay.