oily

oily — adjective

1. having the texture, smell, taste, or shiny appearance of oil — for example, a sl

1.adjectiveB2
Definition

having the texture, smell, taste, or shiny appearance of oil — for example, a slick patch of liquid on the road or skin that shines because it produces too much natural grease.

Example

The puddle near the gas pump had a strange oily shine in the sunlight.

describing surface appearance: oily shine / sheen

Maya's forehead felt oily by lunchtime, so she carried small blotting papers.

describing skin texture

Common collocations
  • oily shine
  • oily sheen
  • oily skin
  • oily smell
  • oily taste
Synonyms
  • greasy

    stronger and more negative; suggests unpleasant residue

  • slick

    focuses on the smooth, slippery surface look

  • oleaginous

    formal or technical; rare in everyday speech

Antonyms
  • dry

    lacking any oil or moisture, especially of skin

  • matte

    of a surface, with no shine

Usage Note

Distinguish from sense 2: this sense describes how something looks, feels, smells, or tastes (a quality), while sense 2 describes literal contact with oil or a high oil content.

Common Mistakes

My skin is oil today.
My skin is oily today.
use the adjective form 'oily', not the noun 'oil', to describe a quality.

2. coated with oil on the outside, or holding a large amount of oil or fat inside —

2.adjectiveB2
Definition

coated with oil on the outside, or holding a large amount of oil or fat inside — said of objects, hands, food, or fish such as salmon and sardines that are naturally rich in oils.

Example

Marcus wiped his oily hands on a rag before shaking the customer's hand.

covered with oil: oily hands / fingers

The mechanic kept a pile of oily rags in a metal box to prevent fires.

collocation: oily rag / cloth

Common collocations
  • oily hands
  • oily rag
  • oily fish
  • oily food
  • oily floor
Synonyms
  • greasy

    more negative; usually about unwanted grease on food or surfaces

  • fatty

    used of food only; focuses on fat content rather than oil coating

  • oil-soaked

    stronger; suggests oil has been absorbed all the way through

Antonyms
  • dry

    containing or covered with no oil

  • lean

    of meat or fish, low in fat

Usage Note

Subject is usually a physical object, body part, food, or fish. With food this can be negative (greasy, unhealthy) or positive ('oily fish' means high in healthy omega-3 oils) — context decides which.

Common Mistakes

Salmon is an oily food, so it is bad for you.
Salmon is an oily fish, but its oils are good for you.
'oily fish' is a fixed phrase that often signals healthy fats, not unhealthy grease.

3. behaving in a smooth, overly polite way that feels false and makes other people

3.adjectiveC1
Definition

behaving in a smooth, overly polite way that feels false and makes other people uncomfortable, as if the person is trying to win you over for their own benefit.

Example

The car salesman gave Lina an oily smile and praised her excellent taste.

describing manner: oily smile

Voters distrusted the mayor's oily charm during the televised debate.

collocation: oily charm / manner

Common collocations
  • oily smile
  • oily charm
  • oily voice
  • oily manner
  • oily salesman
Synonyms
  • smarmy

    very close in meaning; informal British

  • unctuous

    more formal and literary; same insincere quality

  • ingratiating

    neutral-to-negative; focuses on trying hard to please

  • slick

    broader; can also mean clever or skilled, not always negative

Antonyms
  • sincere

    honest and genuine in feeling

  • blunt

    direct and plain, with no polished manner

Usage Note

Always negative and mildly insulting. Subject is usually a person or one of their behaviors (smile, voice, charm, compliments). Often appears in 'an oily [salesman/politician/manager]'. Distinct from sense 1 — this is figurative, never literal.

Common Mistakes

Thank you for your oily welcome!
Thank you for your warm welcome!
'oily' as a compliment sounds like an insult; use 'warm' or 'kind' for sincere praise.

Word family

  • oil
    nounA2
  • oil
    verbB1
  • oilier
    adjectiveB2
  • oiliest
    adjectiveB2
  • oiliness
    nounC1
  • oil-based
    adjectiveB2

Synonym discussion

Sense: adjective/2

All four words describe something with a lot of oil or fat, but they fit different scenes. 'Oily' is the most neutral — it can describe hands, hair, food, or a fish that is naturally rich in oils, with no strong judgment ('oily fish like salmon are healthy'). 'Greasy' is stronger and more negative; it suggests unpleasant residue you want to wipe off ('greasy chips', 'greasy hair'). 'Fatty' is only used for food and focuses on fat content, not on a coating ('fatty meat', 'a fatty diet'). 'Slick' focuses on the smooth, shiny, slippery surface look, often of liquid spreading thinly ('an oil slick on the road'). Compare: a chef calls salmon 'oily fish'; a customer complains the fries are 'greasy'; a doctor warns against 'fatty' food; a driver brakes on a 'slick' road.

oily ↗greasy ↗fatty ↗slick ↗

Common collocations

Nouns

  • oily skin
  • oily hair
  • oily fish
  • oily food
  • oily rag
  • oily smile
  • oily charm
  • oily residue

Adverbs

  • slightly oily
  • very oily
  • deeply oily
  • unpleasantly oily

Phrases

  • an oily sheen
  • an oily film
  • feel oily to the touch

Prepositions

  • oily with [grease/sweat]
  • oily from [cooking/work]

Etymology

Middle EnglishModern English

Formed in late Middle English from the noun 'oil' plus the common adjective ending '-y', meaning 'full of' or 'like'. The literal sense (resembling or full of oil) came first; the figurative sense for a smooth, insincere person developed later, by analogy with how oil makes a surface slippery — such people seem to slide past honest dealing.