Translation guide
Describes something with no mistakes, flaws, or imperfections. In Japanese, the most natural expressions depend on whether you're talking about performance, appearance, logic, or character.
To say that a performance, piece of work, or answer is completely correct with no mistakes.
The most common and versatile word for 'perfect' or 'flawless'. Used for performance, work, plans, etc. Often used with な (na-adjective).
His performance was faultless.
Literally 'there is no place to strike a fault'. A set phrase meaning 'flawless' or 'above reproach'. Slightly more emphatic and formal than 完璧.
Literally 'without deficiency'. Often used in compounds like 完全無欠 (perfect and flawless). Sounds more literary or formal.
To describe something visually or physically perfect, without any blemishes or defects.
To say that an argument, reasoning, or a person's character is beyond criticism.
Strongly implies that there is nothing to criticize. Suitable for character, conduct, or logical consistency.
To praise a flawless technical performance, such as in sports, music, or craftsmanship.
Her English is faultless.
That's a faultless answer.
His work is faultless.
a faultless plan
Again, the go-to word. Works for appearance, condition, or quality.
This diamond is faultless.
Your skin is faultless.
Literally 'not even one scratch'. Used for physical objects or surfaces that are flawless.
a faultless brand-new car
Means 'unblemished' or 'flawless' in a physical sense. Often used for objects, reputation, or record.
faultless pottery
His logic is faultless.
She is a faultless person.
Also works here, but 非の打ち所がない is more idiomatic for moral/logical perfection.
a faultless theory
Means 'no objection' or 'nothing to complain about'. Often used for quality or suitability, but can apply to character.
His response was faultless.
Standard choice for technical perfection.
Her landing was faultless.
Literally 'there are no mistakes'. Simple and direct, often used in sports or performance contexts.
Today's match was faultless.
Means 'safe' or 'without fault', but often implies 'inoffensive' or 'unadventurous'. Use with caution; it can sound like faint praise.
Often implies 'adequate but not outstanding'. Not a direct equivalent of 'faultless' in a positive sense.
a safe/faultless choice (but possibly boring)
a complete recovery (not 'faultless')
Direct translations like 欠点がない (ketteng ga nai) or 誤りがない (ayamari ga nai) are understandable but sound unnatural compared to 完璧 or set phrases. Use the idiomatic options above.
The plan was faultless.