Faultless

adj.capable, joyfulformal

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.

everyday
flawless
performance or appearance has no visible imperfection
not when Flawless sounds promotional when formal verification matters.
everyday
perfect
enthusiastic praise intentionally makes an absolute claim
not when Perfect leaves no room for harmless variation.
professional
error-free
the claim is limited to absence of mistakes
not when Error-free says nothing about elegance or quality.
formal
impeccable
conduct, taste, or presentation meets an exacting standard
not when Impeccable is too polished for a simple correct calculation.

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.

everyday
not at fault
plain language must separate responsibility from outcome
not when The phrase is clumsy as an attributive compliment.
professional
exonerated
an investigation has formally removed blame
not when Exonerated describes a finding, not inherent innocence.
formal
blameless
moral or causal innocence is the only issue
not when Blameless does not praise skill or execution.

faultless performance
A faultless performance earned the apprentice first place.
technically faultless
The repair was technically faultless but visually untidy.
remain faultless
The driver may remain faultless even when a collision occurs.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.