unbreakable

Unbreakable is an adjective that denotes the inability to be broken. In ordinary usage it conveys extreme durability or emotional resilience rather than an absolute property. The term is frequently used hyperbolically to emphasize strength, reliability, or impregnable design.

In materials science, there is no material that is truly unbreakable, since all materials fail under sufficient stress or flaw growth. The relevant properties include strength (resistance to breaking under load), fracture toughness (resistance to crack propagation), ductility (ability to deform), and toughness (overall energy absorbed before failure). High-strength steels, advanced ceramics, and fiber-reinforced composites can exhibit very high resistance to fracture, but flaws, defects, or extreme conditions can still cause failure. As a result, the term is mostly promotional rather than a precise technical designation.

In consumer products, "unbreakable" is often used in marketing to imply superior durability. Examples include bottles, phone cases, or glass marketed as shatter-resistant or impact-resistant. Practical reality varies with design, production quality, and user circumstances; no product is guaranteed to be unbreakable in all situations, and safety warranties typically specify limits.

Culturally, Unbreakable refers to various works, most notably the 2000 film by M. Night Shyamalan, a thriller about a man who discovers extraordinary invulnerability and the consequences of that revelation. The term has since appeared in music, literature, and branding as a metaphor for resilience, perseverance, and the idea of overcoming adversity.