Translation guide
Describes an action or attitude that lacks full effort, enthusiasm, or commitment. Japanese expresses this through adjectives, adverbs, and set phrases that convey doing something without sincerity or energy.
Describe an action or attempt that is not done with full energy or commitment.
The most common and versatile way to say 'half-hearted'. It literally means 'halfway, incomplete' and can describe efforts, attitudes, or results.
He does his work with a half-hearted attitude.
If you start with a half-hearted feeling, you'll fail.
Means doing something in a sloppy, half-hearted, or irresponsible manner. Often implies lack of care.
Don't give a half-hearted reply.
Means 'half-baked' or 'superficial'. Stronger than 中途半端, often used for knowledge or skills.
It's dangerous to take on a challenge with half-hearted knowledge.
Express that an apology, compliment, or gesture is not heartfelt.
Literally 'the heart is not put into it'. Used for insincere words or actions.
His apology was half-hearted.
Means 'superficial' or 'only on the surface'. Describes words or actions that lack depth.
Half-hearted encouragement can backfire.
Describe an action done because one has to, not because one wants to.
中途半端 focuses on incompleteness or lack of full commitment, while いい加減 implies irresponsibility or carelessness. 中途半端 can be used in neutral descriptions, but いい加減 often carries a negative judgment.
You can't succeed with half-hearted effort.
If you do half-hearted work, you'll lose trust.
Avoid directly translating 'half-hearted' as 半分の心 (はんぶんのこころ). It is not idiomatic and will sound unnatural.
子供はいやいや宿題を始めた。
The child started his homework half-heartedly.