The phrase "suo motu" refers to something done voluntarily, without prompting or request. Synonyms for this phrase include self-initiated, on one's own accord, of one's own volition, self-guided, autonomous, and independent. Other similar terms are self-determined, uncompelled, spontaneous, gratuitous, and discretionary. These words denote an action taken by an individual, without outside influence or instruction. Whether it be a decision, action, or organization, these synonyms imply a level of self-reliance and personal choice. So, whether you wish to describe an individual's behavior or the decision of an organization, there are several words that can convey the meaning of "suo motu".