Partial darkness is a term used to describe a situation in which there is not complete darkness, but rather a dim light. This can be caused by a variety of factors, such as the time of day or the presence of clouds. Two words that are often used to describe partial darkness are GLOOM and DUSK. GLOOM is a five-letter word that refers to a state of depression or sadness, while DUSK is a four-letter word that describes the period of time between day and night.