deficiency (n.)

• absence
• adulteration
• baseness
• beggary
• blemish
• break
• bug
• callowness
• catch
• crack
• dearth
• defalcation
• default
• defect
• defection
• defectiveness
• deficit
• demerit
• deprivation
• dereliction
• destitution
• discontinuity
• drawback
• drought
• erroneousness
• failing
• failure
• fallibility
• famine
• fault
• faultiness
• fewness
• flaw
• foible
• frailty
• gap
• hiatus
• hole
• immaturity
• impairment
• imperfection
• impoverishment
• impurity
• inaccuracy
• inadequacy
• inadequateness
• incompetence
• incompleteness
• inexactitude
• inexactness
• infirmity
• insufficiency
• interval
• kink
• lack
• lacuna
• littleness
• maladroitness
• meanness
• mediocrity
• miscarriage
• need
• neglect
• omission
• outage
• patchiness
• pettiness
• privation
• problem
• rift
• scantiness
• scrappiness
• shabbiness
• shortage
• shortcoming
• shortfall
• sin
• sketchiness
• smallness
• snag
• starvation
• subnormality
• taint
• triviality
• ullage
• underage
• underdevelopment
• unevenness
• unskillfulness
• unsoundness
• vulgarity
• want
• weakness