Mirk is a word that is primarily used in Scottish and Middle English. It means "gloomy," "dark," or "murky." There are several synonyms that can be used in place of this word, such as "dim," "dusky," "shadowy," "obscure," or "tenebrous." These words can be used to describe a variety of situations or environments, such as a dimly lit room or a foggy, misty forest. Mirk can also be used to describe a person's mood or emotions, in which case synonyms such as "melancholy," "gloomy," or "sad" might be more appropriate. Regardless of the specific context, there are many words that can be used to convey the same sense of gloom, darkness, or obscurity as the word "mirk".