pitch-dark

pitch-dark
ˌpitch-ˈdark adjective
completely dark:
    Outside it was pitch-dark and pouring with rain.
     

THESAURUS

   ▪ dark if a place is dark, there is little or no light: The room was very dark. | No, you can’t play outside, it’s too dark. | It was a dark night with clouds covering the moon.
   ▪ dimly-lit a dimly-lit building or place is fairly dark because the lights there are not very bright: a dimly-lit restaurant | The church was dimly lit.
   ▪ dim a dim light is fairly dark: The camera can take good pictures even in dim lighting. | The evening sky grew dim.
   ▪ darkened a darkened room or building is darker than usual, especially because its lights have been turned off or the curtains have been drawn: The prisoner lay in a darkened room. | The play starts with a darkened stage, and the sound of a woman singing softly.
   ▪ gloomy a gloomy place or room is not at all bright or cheerful: The bar was gloomy and smelled of stale cigar smoke.
   ▪ murky dark and difficult to see through – used especially about water: the murky waters of the lake | I could hardly see him in the murky light of the bar.
   ▪ pitch-dark/pitch-black completely dark, so that nothing can be seen: It was pitch-dark inside the shed.
   ▪ shady a shady place is cooler and darker than the area around it, because the light of the sun cannot reach it: It was nice and shady under the trees. | They found a shady spot for a picnic.