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Definition of harmless : 1. Free from harm; unhurt; as, to give bond to save another harmless.
2. Free from power or disposition to harm; innocent; inoffensive.

Synonyms:

innocent, righteous, powerless, right, poisonous, sound, sinless, innoxious, white, hurtless, naive, undefiled, insipid, uncontroversial, unoffensive, sterile, controllable, navigable, inoffensive, guileless, reliable, manageable, clean, benign, virtuous, harmful, preventable, immaculate, sanitary, pure, inoperative, trustworthy, anodyne, injurious, help, protective, nonmalignant, weak, unoffending, unblamable, avoidable, kind, gentle, blameless, benignant, stainless, spotless, irreproachable, upright, lily-white, guiltless, faultless, innocuous, unblemished, clear, simple

protected, inviolable, safe, secure, sure, immune

Usage examples:

• He was stating facts, which, in his apprehension, were harmless, and why should he not let them out? - "Witchcraft of New England Explained by Modern Spiritualism", Allen Putnam.
• She had been trying to avoid the direct question as far as possible, but this one seemed so harmless. - "The Thousandth Woman", Ernest W. Hornung.
• It is very simple, and such a harmless act that it could be condemned by no one." - "The Gods of Mars", Edgar Rice Burroughs.