Mild-mannered is an adjective used to describe someone who is gentle, humble, and unassuming in their behavior. MEEK, DOCILE, TAME, and softspoken are all synonyms for mild-mannered, each with four, six, four, and ten letters respectively. MEEK means to be humble and submissive, DOCILE means to be easily managed or handled, TAME means to be domesticated or subdued, and softspoken means to speak in a quiet and gentle manner.