Fear of Depths
Bathophobia
Bathophobia is a fear of depths, and the reference description makes clear that the threshold is not the depth itself but whether the far end of it can be seen. That distinction is the only substantial thing anybody has written about the word.
Why the visible bottom is the threshold
The 2008 encyclopedia of phobias describes the fear as showing itself in three ordinary places:
- looking into a dark room
- going boating
- swimming in deep water
It then makes the observation that the entry turns on. Someone who fears depths may be comfortable while the bottom of the lake is visible and not comfortable once it is not. The same person may be untroubled in a dark space if they already know the size of the room.
Read carefully, that is not a fear of depth. It is a fear of an extent the person cannot establish. The water at four metres is the same water whether or not the bottom shows, and the room is the same room in the dark; what changes is whether the boundary is known. The condition attaches to the missing information rather than to the distance.
That also explains why one word covers water and darkness, which otherwise have nothing in common. Both can present a person with a space whose far side cannot be located.
What the record behind bathophobia amounts to
Wikipedia carries no article on bathophobia. The title exists as a soft redirect pointing at Wiktionary, which is what Wikipedia does with a word that has a definition and no subject. Wiktionary's own entry has one citation, a 2004 fantasy novel in which a character is told that fear of the dark is nyctophobia and fear of deep places is bathophobia.
The talk page is a record of the same thinness from the other side. Its edit history runs from 2004 to 2006 and one entry notes the deletion of an external link because the site it pointed to offered little information while trying to sell something. That was the state of the online record for the word twenty years ago and the redirect says it has not changed.
Why bathophobia is confused with ablutophobia
The first element is the Greek bathos, depth, which gives bathymetry and bathysphere. It has nothing to do with a bath, and the resemblance sends readers to ablutophobia, the fear of bathing and washing, which is an unrelated condition with its own reference entry. The confusion runs in one direction only, since nobody reading about ablutophobia expects it to concern the sea.
What a clinician would do with it
Nothing, under this name. A person who cannot swim where the bottom is out of sight would be assessed as having a specific phobia of the situation, and the notes would describe the water. No prevalence figure exists, no case has been published, and no manual carries the term. What the catalogue can say is that the description in the reference book is unusually precise for a word with no evidence behind it, and that its precision points somewhere the name does not.
Told apart
Often confused with Fear of Depths
- Fear of Bathing and WashingAblutophobia looks like the same word and is not related to it. Bathos is depth; the bath in ablutophobia comes from the Latin abluere, to wash.
- Fear of the DarkThe reference description puts a dark room and deep water under one heading, and says the fear lifts in a dark room whose size is known. Nyctophobia does not lift for that reason.
- Fear of WaterAquaphobia covers the water. This covers the part of it below where the bottom stops being visible, and by the same description covers rooms as well.
Common questions
Questions about Bathophobia
- Is it a fear of deep water specifically?
- Not by the description in the reference book, which covers a dark room as readily as a lake. The consistent element is that the far boundary cannot be located: a swimmer who can see the bottom may be fine, and the same person may be untroubled in the dark if they already know how large the room is.
- Is it the same as a fear of bathing?
- No. The first element is bathos, the Greek for depth, which also gives bathymetry and bathysphere. Ablutophobia, the fear of bathing and washing, comes from the Latin abluere. The two words look alike and share nothing.
- Why does Wikipedia not have an article on it?
- Because there is nothing to write. The title is a soft redirect to Wiktionary, which is how Wikipedia handles a word that has a definition rather than a subject. The dictionary entry rests on one citation, from a fantasy novel published in 2004.
Added 2026-08-23 · Revised 2026-08-26
Nearby in the catalogue
Related entries
- Fear of Bathing and WashingAvoiding washing and washing compulsively are filed under one term, and the encyclopedia routes both to obsessive-compulsive disorder without saying how they meet.
- Fear of the DarkThe object of this fear cannot be produced, which is why reassurance fails. Two real prevalence figures exist for it and they are constantly quoted as one.
- Fear of WaterHydrophobia was already in use for a symptom of rabies, so the fear of water took a Latin root. Three prevalence studies exist for it and none agrees with the others.
- Fear of ForestsAristotle took hyle from timber to name matter, and the phobia word inherited both. One reference entry defines it as fear of a forest or fear of materialism.
- Fear of Submerged Man-Made ObjectsMost sufferers name no trauma and no triggering event, reporting instead that symptoms arrived after a lifetime of ordinary contact.
- Fear of Environmental CatastropheCoined in a 1988 newspaper column to name fear of an inhospitable planet, it now names the indifference toward nature that is making it that way.