Faultless
What it means
Meaning 1
Containing no detectable mistake or defect under the standard being applied.
Reach for it when giving strong praise to execution that survives careful scrutiny
The quartet delivered a faultless final movement under difficult conditions.
Meaning 2
Not responsible for a mistake, harm, or failure.
Reach for it when clearing someone of blame rather than praising perfection
The review found the night guard faultless in the delayed response.