expression, i-adjective
harmless; innocuous; safe; benign
Describes something that causes no harm, danger, or negative effect. Used for people, animals, substances, actions, or remarks.
この虫は害のない種類です。
This insect is a harmless species.
彼の冗談は害のないものだった。
His joke was harmless.
無害 is a more formal, Sino-Japanese noun/adjective meaning 'harmless' or 'innocuous', often used in technical or official contexts. 害のない is a more colloquial, descriptive phrase.
安全 means 'safe' or 'secure' in a broader sense, focusing on absence of danger or risk. 害のない specifically emphasizes the lack of harmful effects.
Phrase composed of 害 (harm) + の (possessive particle) + ない (negative form of ある). Literally 'without harm'.