Declivities are defined as downward slopes or inclinations. There are many synonyms for declivities which can be used in various contexts to convey a similar meaning. Some of the synonyms which can be used interchangeably with declivities are slant, inclination, slope, pitch, descent, dip, decline, incline, gradient, drop, downturn, descent, fall, and downhill. These synonyms can be used to describe various terrains such as hills, mountains, valleys, and even streets and roads. They can also be used to describe emotional or mental states such as a decrease in mood or energy levels. Using synonyms for declivities can add variety and depth to written and spoken language.