English Reference
noun

toughness

n.
US /ˈtəfnəs/ UK /tˈʌfnəs/ tough·ness UK spelling toughnesses

  1. 01 B2 Upper Intermediate

    the ability to deal with pain, difficulty, or hardship without giving up.

    the quality of being strong enough to endure hardship or strain; psychological resilience or physical stamina.

    Simple

    The marathon runner showed incredible toughness by finishing the race with a hurt leg.

    In context

    The candidate's mental toughness was tested during the grueling three-day interview process designed to simulate high-pressure environments.

  2. 02 C1 Advanced Technical Science

    the quality of being strong and difficult to break or tear.

    the ability of a material to absorb energy and deform plastically without fracturing.

    Simple

    The toughness of the leather makes it perfect for heavy-duty work boots.

    In context

    Engineers selected this specific alloy for its exceptional fracture toughness, ensuring the bridge could withstand extreme thermal expansion.

    Usage

    Uncountable when referring to the general property of a material.

    durabilitysturdiness
    brittleness
  3. 03 B2 Upper Intermediate

    the quality of being very strict or firm about rules and behavior.

    the quality of being uncompromising or severe in the enforcement of standards or discipline.

    Simple

    The coach is known for his toughness, but his players always improve.

    In context

    The administration's toughness on budget deficits led to significant cuts in public spending across all departments.

    strictnessseverityrigour

Aspergillus niger was one of five microbes, including bacteria and fungi, selected for this study because of its known toughness in spaceflight environments.

Phys.org· 19 Aug 2026

The scene was as much about showing Rocky’s toughness as it was about making a protein-rich drink to become stronger.

The Conversation· 21 Aug 2026

From Middle English toughnesse, towghnesse, towghenesse, equivalent to tough + -ness.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Middle English toughnesse
Level B2 · Upper Intermediate
Frequency Frequent
Updated