beneficial and harmless; good with no drawbacks
Describes something that is entirely positive, with no negative side effects. Often used in formal or written contexts to emphasize safety and benefit.
This supplement is advertised as beneficial and harmless.
His proposal was something beneficial and harmless.
A four-character compound (yojijukugo) combining 有益 (beneficial) and 無害 (harmless). The exact origin is uncertain, but it follows a common pattern of pairing positive and negative terms to express a complete idea.