What does abyss mean?
An abyss is a deep, vast, and apparently bottomless space — most often applied to ocean trenches, caverns, or great chasms in the earth. By extension, the word describes any profound void or unbridgeable gulf: an abyss of despair, ignorance, poverty, or grief, or the abyss separating two people's worldviews. Because it suggests something without measurable depth or end, the word carries heavy emotional weight, evoking danger, hopelessness, and the unknown. It appears frequently in literature and philosophy, notably in Nietzsche's famous warning that if you gaze long into the abyss, the abyss gazes also into you. In scientific usage, "abyssal" describes the deepest zones of the ocean, where sunlight never penetrates. Derived from Greek through Latin, the word entered English in the late Middle Ages and remains a powerful choice when ordinary words like "hole" or "gap" feel inadequate to the scale of what is being described.
nounA deep, seemingly bottomless chasm or gulf; figuratively, a profound difference, void, or state of despair.
- A deep or seemingly bottomless physical chasm, such as an ocean trench or gorge.
- A vast figurative gulf or void — of misery, ignorance, moral ruin, or separation between things.
"The explorers peered into the abyss and saw only darkness below."
"The submarine descended slowly toward the lightless abyss of the Mariana Trench."
"After losing his job and his home, he felt himself sliding into an abyss of despair."
The plural is uncommon in everyday use but appears in scientific and descriptive writing referring to multiple deep chasms or voids.
"The expedition charted several previously unmapped abysses along the continental shelf."
The Greek root of "abyss" means "bottomless" — so by definition, no matter how far you fall into one, you never actually reach the bottom.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of abyss
The word "abyss" derives from the Greek "ábyssos," meaning "bottomless," formed from the privative prefix "a-" plus "byssós," meaning "depth" or "sea floor." It passed into Latin as "abyssus" and was adopted into English via Old French in the late medieval period, initially with religious overtones of the primordial deep or the underworld. Its figurative senses of spiritual or moral ruin developed alongside the literal sense, and the adjective "abyssal" later became established in oceanography for the deepest regions of the sea.
Related word forms
How abyss is actually used
Register is neutral to slightly formal or literary. The literal sense (ocean depths, geological chasms) is common in scientific writing; the figurative sense carries strong connotations of danger, hopelessness, or immeasurable distance. The plural is rare outside technical contexts.
Easily confused with abyss
"Abysm" is an archaic form of the same word meaning a bottomless gulf, while "abyss" is the modern standard term; "abysmal" as an adjective now usually means extremely bad rather than literally deep.