S: (v) etiolate (make weak by stunting the growth or development of)
S: (v) cripple, stultify (deprive of strength or efficiency; make useless or worthless) "This measure crippled our efforts"; "Their behavior stultified the boss's hard work"
S: (v) dampen (reduce the amplitude (of oscillations or waves))
S: (v) neutralize, neutralise, nullify, negate (make ineffective by counterbalancing the effect of) "Her optimism neutralizes his gloom"; "This action will negate the effect of my efforts"