impairment (n.)

• adulteration
• attrition
• curtailment
• cut
• cutting
• damage
• debilitation
• decrease
• decrement
• defectiveness
• deficiency
• depletion
• depreciation
• derogation
• deterioration
• detraction
• detriment
• diminution
• dip
• disadvantage
• disparagement
• drawback
• enfeeblement
• erroneousness
• extraction
• fallibility
• faultiness
• flaw
• handicap
• harm
• hurt
• immaturity
• imperfection
• impurity
• inaccuracy
• inadequacy
• inadequateness
• incompleteness
• inexactitude
• inexactness
• injury
• lack
• lessening
• liability
• loss
• mediocrity
• mischief
• patchiness
• prejudice
• reduction
• remission
• retraction
• retrenchment
• shortage
• shortcoming
• shortening
• shrinkage
• sketchiness
• truncation
• unevenness
• unsoundness
• vitiation
• want
• weakening
• worsening