Etymology

unctuous

unc·tu·ous
U1N1C3T1U1O1U1S1

Today it means: Having the nature or properties of an unguent or ointment; greasy, oily. Full definition →

Middle English unctuous ← Medieval Latin ūnctuōsus ← Latin ūnctum
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The story

  1. Proto-Indo-European · derived from*h₃engʷ-“to anoint; to smear”
  2. Latin · derived fromūnctum“ointment; rich banquet; rich savoury dish”
  3. Medieval Latin · derived fromūnctuōsus“greasy, oily, unctuous”
  4. Middle English · inherited fromunctuous
  5. English todayunctuous

From Late Middle English unctuous [and other forms], borrowed from Medieval Latin ūnctuōsus (“greasy, oily, unctuous”), from Latin ūnctum (“ointment; rich banquet; rich savoury dish”) + -ōsus (suffix meaning ‘full of; overly’ forming adjectives from nouns). Ūnctum is a noun use of the perfect passive participle of unguō (“to anoint; to smear with oil, to grease or oil”), from Proto-Indo-European *h₃engʷ- (“to anoint; to smear”). Cognates * Italian untuoso * Old French onctües, unctueus, unctuose (modern French onctueux) * Portuguese unctuoso * Spanish untuoso

Words from the same roots

Proto-Indo-European*h₃engʷ- all →

ointmentunguentinunctionkouign-amann

Etymology from Wiktionary, CC BY-SA 4.0.