un·break·a·ble 
(ŭn-brākə-bəl)
(ŭn-brākə-bəl)adj.
1. Impossible to break; able to withstand rough usage: unbreakable plates.
2. Able to withstand an attempt to break. Used of a horse.
n.
An article or object that is not easily broken.
un·breaka·ble·ness n.
un·breaka·bly adv.
- invidious
- invidiously
- in view of
- invigorate
- invigoratingly
- invigoration
- invigorator
- invincibility
- invincible
- invincibleness
- invincibly
- inviolability
- inviolable
- inviolableness
- inviolably
- inviolacy
- inviolate
- inviolately
- inviolateness
- in virtue of
- inviscid
- invisibility
- invisible
- invisible hand
- invisible ink