Crossword clue: a bottomless gulf or pit; any unfathomable (or apparently unfathomable) cavity or chasm or void extending below

The most common answer is abysm (5 letters).

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

abysm 5 letters wn-def

a bottomless gulf or pit; any unfathomable (or apparently unfathomable) cavity or chasm or void extending below

abyss 5 letters wn-def

a bottomless gulf or pit; any unfathomable (or apparently unfathomable) cavity or chasm or void extending below