DictionarystiffHard to bend or move
adjective

stiff

STIF/stɪf/

Resistant to bending or yielding.

The stiff boot sole resists the man's efforts to bend it.

An older man tests a stiff boot sole, gripping the heel and toe and trying to bend them toward each other; despite visible effort, the thick sole remains almost straight.
Etymology

Old English stif described something rigid and not easily bent. That physical resistance also underlies the extended senses of awkward movement and a manner lacking ease.

In context

Window Cleaning Resource1:30
unlike hard rubber which can become stiff in low temperatures soft rubber retains its flexibility
Hard vs. Soft Rubber: The Window Cleaner's Guide

More examples

  • My knees feel stiff after the long drive.
  • Our team faces stiff competition in the finals.
  • Drivers face stiff fines for speeding near schools.
  • His stiff greeting makes everyone feel awkward.

Forms

stiff · stiffer · stiffest

stiffen verb — To become or make less flexible.

stiffness noun — The quality of resisting bending or movement.

Similar words

rigid
Suggests almost no bending, rather than merely resisting it.
inflexible
Emphasizes inability to bend or unwillingness to adapt.
hard
Emphasizes resistance to pressure or scratching, not necessarily bending.