Mentally/ˈmentəli/ Definition 1 of 3Pro Tip 1/3Emotional Strength Indicates resilience traditionally associated with character, not just intellect. Despite the setbacks, she remained mentally strong. Pro Tip 2/3Preparation Context Often used to describe readiness for an event beyond physical aspects. He was mentally prepared for the marathon. Pro Tip 3/3Intellectual Activity Can describe an action performed by thinking, not involving physical movement. She solved the puzzle mentally before writing anything down.