faultless

As adjectives the difference between irreproachable and faultless

is that irreproachable is free from blame, not open to reproach or criticism; blameless while faultless is without fault; free from defect or error.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective faultless is

without fault; free from defect or error.

Indefective is a synonym of faultless.

As adjectives the difference between faultless and indefective

is that faultless is without fault; free from defect or error while indefective is not defective; perfect; complete.

Faultful is a antonym of faultless.

As adjectives the difference between faultless and faultful

is that faultless is without fault; free from defect or error while faultful is full of faults or sins.