What does unbreakable mean in crosswords?

unbreakable means: impossible to break especially under ordinary usage

Which crossword clues can have unbreakable as the answer?

Possible clues for unbreakable include "Hard to smash".

Word entry · 11 letters

Best crossword clue

"Hard to smash"

11 letters · collected on this word page

11 lettersSorted aabbeeklnruStarts with UEnds with E1 clues

1U2N3B4R5E6A7K8A9B10L11E

01“Hard to smash”11 letters

Not quite right?

U__________