inflatable

inflatable — adjective

1. made so that you can put air or another gas inside it until it becomes firm and

1.adjectiveB1
Definition

made so that you can put air or another gas inside it until it becomes firm and ready for use — used for products like mattresses, boats, and toys that you pump up.

Example

Nellie bought an inflatable mattress for her camping trip.

attributive use: inflatable + noun (mattress, boat, pool, toy, etc.)

This life raft is inflatable and packs into a small bag.

predicative use: be + inflatable

Common collocations
  • inflatable mattress
  • inflatable boat
  • inflatable pool
  • inflatable toy
  • inflatable tent
  • inflatable furniture
Synonyms
  • blow-up

    informal; used only before a noun, e.g. a blow-up bed

  • pneumatic

    technical; used for devices that operate using compressed air, e.g. pneumatic tyres

Antonyms
  • solid

    made from hard materials, not designed to be filled with air

  • deflated

    refers to an object that has lost its air, not to design

Grammar Patterns

inflatable + noun

be + inflatable

Usage Note

Do not confuse 'inflatable' (referring to a design that can be filled with air) with 'inflated' (already filled with air). An inflatable mattress is one you can blow up; an inflated mattress is already full of air.

Common Mistakes

The balloon is inflatable with helium.
The balloon is inflated with helium.
'inflatable' describes what the object is designed for; 'inflated' describes its current state.

inflatable — noun

Word family

  • inflate
    verbB1
  • inflated
    adjectiveB2
  • inflation
    nounB1
  • deflate
    verbB2
  • deflated
    adjectiveB2
  • deflation
    nounC1
  • reflate
    verbC2

Synonym discussion

Sense: adjective/1

'Inflatable', 'blow-up', and 'pneumatic' all relate to objects that use air. 'Inflatable' is the standard neutral term for any product designed to be filled with air — it works in both formal and everyday contexts (an inflatable mattress, an inflatable boat). 'Blow-up' is informal and appears only before a noun (a blow-up bed, a blow-up pool); it is rarely used in writing beyond casual conversation. 'Pneumatic' is a technical word for machinery that operates using compressed air, such as pneumatic drills or pneumatic tyres; it would sound unnatural for a children's pool toy. Choose 'inflatable' for everyday use, 'blow-up' for casual speech, and 'pneumatic' only for mechanical or industrial contexts.

inflatable ↗blow-uppneumatic

Common collocations

Nouns

Phrases

  • blow up an inflatable
  • deflate an inflatable
  • pump up an inflatable

Prepositions

  • in an inflatable
  • on an inflatable

Etymology

LatinEnglish

'Inflatable' comes from the Latin verb 'inflare', meaning 'to blow into' ('in-' meaning 'into' plus 'flare' meaning 'to blow'). This gave English the verb 'inflate' (first recorded in the 1500s). The suffix '-able', meaning 'able to be', was added to form 'inflatable' in the early 1800s, originally used to describe objects designed to be filled with air, such as life vests and air mattresses. The noun uses — meaning an actual inflatable object — developed later in the 1900s as products like pool toys, rubber boats, and bouncy castles became common.