Pitch-dark is a term that we use to describe complete darkness. However, there are various other commonly used synonyms to describe it. Some examples include absolute darkness, black as coal, midnight black, ink-black, dead of night, and coal-black. Another popular term is "inky-black," which conjures up a mental image of an inky, black sky. "Jet-black" is also another popular choice to describe complete darkness. Another great phrase is "gloomy" which is often used to convey a sense of unease or eeriness related to darkness. Other synonyms liken darkness to the absence of light, such as "lightless" and "starless". Altogether, there are plenty of words that we can use to effectively describe the state of complete darkness.