The Latin word acerbus
Word acerbus
Meaning bitter, gloomy, dark

Other words that might be of interest
fumus ‘smoke’, sol ‘sun’, ignis ‘fire’, cinis ‘ash’, nox ‘night’, acerbitas ‘harshness, bitterness’, acidus ‘sharp, sour’, amaritudo ‘bitterness’, candidus ‘bright, shining, white’, clarus ‘clear, bright, famous, illustrious’