This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. The characteristic of being harmless.

n. The character or state of being harmless.

"His great talent, his modesty, and above all what people were pleased to describe as his harmlessness, made everybody like him."

artlessness    selflessness    meekness    guilelessness    loving-kindness    mildness    heartedness    self-mastery    amiableness    goodwill