The adjective serene means calm, peaceful, or tranquil. It is most commonly used to describe people who display a notably unruffled manner, or natural surroundings that are fair and calm. When applied to people, serene suggests dignity, composure, and graciousness. When applied to nature, it suggests mellowness. Unlike peaceful, serene is not used to describe relations, as between nations, or processes, such as transitions of power. In fact, serene, when not describing an individual's expression or demeanor, is more likely to turn up in descriptions of settings where people are scarce!

Someone who is intrepid stays their course regardless of obstacles that arise. This bold adjective is a close synonym for fearless, but intrepid suggests a degree more resolve and daring. Adventurers, explorers, and travelers are all commonly described as intrepid; reporters, too, though not scaling mountains and traversing seas, are often described as intrepid, surmounting obstacles of a different variety. The phrase intrepid soul is used to refer to an individual who dares to do something to the surprise, delight, or admiration of others.

The verb invigorate is bursting with life! It means “to give vigor to” or “to fill with life and energy.” This animated term is similar to energize, but invigorate, drawing on vigor “vitality,” emphasizes healthy physical or mental energy or power. A brisk walk in mountain air will invigorate your senses; a fascinating conversation will invigorate your mind; and, applied a little more broadly, actions taken by a governing body, such as a city government, might invigorate a local economy.