selflessness selflessly • selfly · · · Info · Definitions · Synonyms · Characters · · selflessness · · Text Latin · · Script 12 · · Length Definitions · · · (noun) the quality of unselfish concern for the welfare of others. Synonyms: altruism. · · Noun Definition 1 (noun) acting with less concern for yourself than for the success of the joint activity. Synonyms: self-sacrifice. · · Noun Definition 2 Synonyms · · · altruism · · Synonym 1 self-sacrifice · · Synonym 2 Characters · · e latin small letter e U+0065 f latin small letter f U+0066 l latin small letter l U+006C n latin small letter n U+006E s latin small letter s U+0073