Something that can't be shattered, cracked, or easily destroyed is unbreakable. If your new cellphone is truly unbreakable, it will hold up no matter how many times you drop it on the floor.

Use this adjective for anything that's physically durable, like the unbreakable glass used for car windshields or the unbreakable plastic bottles that ketchup comes in. It's impossible, or nearly impossible, to break these things. Things that are figuratively unbreakable can't be destroyed either, like the unbreakable bond between twins or the unbreakable secret code used by spies.

Definitions of unbreakable
  1. adjective
    impossible to break especially under ordinary usage
    unbreakable plastic dinnerwear”
    difficult or impossible to break or separate into parts
    shatterproof, splinterless, splinterproof
    resistant to shattering or splintering
    see moresee less
    capable of being broken or damaged
    brickle, brickly, brittle
    having little elasticity; hence easily cracked or fractured or snapped
    crumbly, friable
    easily broken into small fragments or reduced to powder
    tending to crumble or break into flakes due to a large amount of shortening
    delicate, fragile, frail
    easily broken or damaged or destroyed
    capable of being broken
    subject to breaking into sharp slender pieces
    show more antonyms...
Word Family

Test prep from the experts

Boost your test score with programs developed by Vocabulary.com’s experts.

  • Proven methods: Learn faster, remember longer with our scientific approach.
  • Personalized plan: We customize your experience to maximize your learning.
  • Strategic studying: Focus on the words that are most crucial for success.


  • Number of words: 500+
  • Duration: 8 weeks or less
  • Time: 1 hour / week


  • Number of words: 500+
  • Duration: 10 weeks or less
  • Time: 1 hour / week


  • Number of words: 700+
  • Duration: 10 weeks
  • Time: 1 hour / week