DictionaryfalterLose steadiness
verb

falter

FAWL-ter/ˈfɔːltər/

To become unsteady, hesitant, or less effective.

The runner falters as one knee begins to buckle.

An exhausted runner falters mid-stride: her knee buckles, her torso sags sideways, and her arms spread unevenly as she struggles to keep moving.
Etymology

Its origin is unknown, but its earliest recorded meaning was “stagger, totter.” That physical unsteadiness offers a useful image for confidence, strength, or progress becoming less steady.

In context

Prof. Sam Vaknin43:43
the thoughts of the narcissists constantly wander or become obsessive and repetitive his speech May falter
How Narcissist Falls Apart (Compilation)

More examples

  • The engine began to falter on the steep hill.
  • Her confidence faltered after the mistake.
  • The runner faltered but did not stop.

Forms

falter · falters · faltered · faltering

Similar words

hesitate
Hesitate means pause through uncertainty; falter can also mean weaken or lose steadiness while continuing.
stumble
Stumble can mean trip or make an error; falter more broadly means lose strength, confidence, or fluency.