Unbreakable

Built to resist breaking under expected force or use.

Reach for it when Describing a material object designed for exceptional durability.

The field kit stores samples in an unbreakable inner case.

• everyday

  durable

  long service matters more than absolute strength

  not when allows wear and eventual failure

• professional

  shatterproof

  resistance to cracking is the exact feature

  not when not for flexible items or emotional bonds

• formal

  indestructible

  near-total resistance to physical ruin

  not when often overstates ordinary durability

Too strong in loyalty, resolve, or relationship to be destroyed.

Reach for it when Praising a human bond or commitment that survives severe strain.

Years of shared work formed an unbreakable trust between the crews.

• everyday

  inseparable

  people remain closely connected

  not when not for resolve or trust held at a distance

• warm

  enduring

  a bond continues across time

  not when does not stress survival under attack

• literary

  steadfast

  loyalty refuses to weaken

  not when better for a person or quality than a relationship

• fragile
• breakable
• fickle
• severable

• unbreakable container

  An unbreakable container protected the specimens during the descent.

• unbreakable bond

  Their unbreakable bond endured years on different continents.

• unbreakable resolve

  Unbreakable resolve carried the rescue campaign through winter.