attenuate

verb

• 1reduce the force, effect, or value of:her intolerance was attenuated by an unexpected liberalism
• reduce the amplitude of (a signal, electric current, or other oscillation): the filter must severely attenuate frequencies above 10 Hz
• reduce the virulence of (a pathogenic organism or vaccine):researchers hoped that the substance would attenuate the course of the disease

• 2reduce in thickness; make thin.

adjective

• reduced in force, effect, or physical thickness: the doctrines of Christianity became very attenuate and distorted