na-adjective, noun
Describes a situation, treatment, or judgment that is biased or incomplete, often implying unfairness. Commonly used in contexts like 片手落ちな態度 (a one-sided attitude) or 片手落ちの判断 (a partial judgment).
彼の意見だけを聞くのは片手落ちだ。
Listening only to his opinion is one-sided.
片手落ちな評価をしないように気をつけてください。
Please be careful not to make a partial evaluation.
偏る is a verb meaning 'to be biased' or 'to lean to one side', often used for tendencies or distributions, whereas 片手落ち is an adjectival noun describing a state of being one-sided or partial.
Compound of 片手 (one hand) and 落ち (falling, omission), literally 'one hand missing'. The exact historical derivation is uncertain, but the word figuratively expresses incompleteness or bias.