Tranquil/ˈtræŋkwɪl/ Definition 1 of 2Pro Tip 1/3Nature Scenery Often used to describe outdoor settings that are undisturbed by human activity. Hikers enjoy the tranquil beauty of untouched forests. Pro Tip 2/3Quiet Ambiance Can refer to a place's quiet atmosphere, ideal for rest or relaxation. The spa's tranquil environment soothed her tense nerves. Pro Tip 3/3Mental State Sometimes used metaphorically to describe a peaceful state of mind. Yoga helps him maintain a tranquil mindset amidst stress.