The quality or state of being free from hate; the absence of hostility or malice; a condition of loving or neutral regard for others.
From 'hateless' + '-ness' (Old English suffix creating abstract nouns). This doubly-suffixed word is quite rare, showing how uncommon it is to need a noun form for the absence of hatred.
Adding '-ness' to '-less' creates words that circle around negatives—we layer suffixes trying to name the absence of something, when maybe what we're really looking for is a positive word we're missing.
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