Translation guide
The quality of being disloyal, unreliable, or untrustworthy, especially in personal relationships or duties.
Expressing unfaithfulness or betrayal, especially in romantic or close personal relationships.
Describing a person who cannot be trusted to keep promises or fulfill obligations.
Referring to absence of belief or loyalty to a religion or deity.
The English noun 'faithlessness' is abstract and rarely used in casual speech. In Japanese, it's more natural to use specific words like 浮気 (cheating) or phrases like 当てにならない (unreliable) depending on context, rather than a single abstract noun.
A general term for insincerity or lack of faithfulness, often used in personal relationships. It implies a breach of trust.
I was disappointed by his faithless attitude.
Specifically refers to cheating or having an affair. Very common in romantic contexts.
We broke up because of her infidelity.
A change of heart, often implying fickleness or loss of affection. Can be used for faithlessness in love.
His change of heart was sudden.
A formal or literary term for betrayal of trust, often used in serious contexts like politics or business.
That act was regarded as an act of faithlessness.
Also used for general unreliability and lack of integrity beyond romantic contexts.
He is faithless, so he doesn't keep his promises.
Irresponsibility; often used when someone fails to fulfill duties or commitments.
Everyone is troubled by his faithless behavior.
A colloquial phrase meaning 'unreliable' or 'not to be counted on'. Natural in everyday speech.
He's faithless, so you'd better not ask him.
Lack of religious faith or belief. Neutral term.
His faithlessness saddened his family.
Can also be used in religious contexts for apostasy or betrayal of faith, but is formal/literary.
He confessed his faithlessness to God.