undamped

(-dampt)

adjective

not damped; specif.,
  1. not disheartened or discouraged
  2. Elec. not decreasing in amplitude

See undamped in American Heritage Dictionary 4

adjective
  1. Physics Not tending toward a state of rest; not damped. Used of oscillations.
  2. Not stifled or discouraged; unchecked: undamped ardor.

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