Word
fathom
Phoneticsfath·om, stress on the first syllable
US/ˈfæðəm/
UK/fˈæðəm/
Definition
v. to understand something difficult or strange after thinking about it for a long time. You often use it in the negative when you find a situation impossible to explain.
v. to penetrate to the truth of something; to comprehend a difficult or obscure concept. Frequently used in negative constructions to indicate a total lack of understanding.
Examples
“I cannot fathom why he decided to quit his job.”
“After hours of debate, the committee still could not fathom the logic behind the CEO's sudden strategy shift.”
“The sheer scale of the universe is something the human mind struggles to fathom, as our daily experiences occur on a vastly different physical dimension.”
Examples
simple
“I cannot fathom why he decided to quit his job.”
contextual
“After hours of debate, the committee still could not fathom the logic behind the CEO's sudden strategy shift.”
complex
“The sheer scale of the universe is something the human mind struggles to fathom, as our daily experiences occur on a vastly different physical dimension.”
Usage
The verb is transitive and takes a direct object, often a 'why' or 'how' clause.
Pitfall
I can't fathom to understand it
I can't fathom it
Fathom already means 'to understand'; adding 'to understand' after it is redundant.
Real-World Examples
“People can’t fathom that the Dark Personality is dark, they can’t believe that anyone would want to be deliberately harmful, they can’t process that harm was caused at all.” “That AI could not fathom the experience of being unable to hear isn’t surprising.” Etymology
From Middle English fathome, fadom, fadme (“unit of length of about six feet; depth of six feet for nautical soundings; (loosely) cubit; ell”) [and other forms], from Old English fæþm, fæþme (“encircling or outstretched arms, bosom, embrace; envelopment; control, grasp, power; fathom (unit of measurement); cubit”) [and other forms], from Proto-West Germanic faþm (“outstretched arms, embrace; fathom (unit of measurement)”), from Proto-Germanic faþmaz (“outstretched arms, embrace; fathom (unit of measurement)”), from Proto-Indo-European pet-, peth₂- (“to spread out; to fly”). Cognates * Ancient Greek πέταλος (pétalos, “broad; flat”), πετᾰ́ννῡμῐ (petắnnūmĭ, “to open; to spread out; to be dispersed or scattered”) (whence English petal) * Gothic 𐍆𐌰𐌸𐌰 (faþa, “fench; hedge”) * Latin pateō (“to extend, increase; to be accessible, attainable, open; to be exposed, vulnerable”) * Low German fadem, faem (“cubit; thread”) * Middle Dutch vadem (modern Dutch vaam, vadem (“fathom”)) * Norwegian Bokmål favn (“an embrace; a fathom”) * Old Frisian fethm (“outstretched arms”) * Old High German fadam, fadum (“cubit”) (Middle High German vade (“enclosure”), vadem, vaden, modern German Faden (“fathom; filament, thread”)) * Old Norse faþmr (Danish favn (“an embrace; a fathom”), Icelandic faðmur (“an embrace”), Swedish famn (“the arms, bosom; an embrace”)) * Old Welsh etem (“thread”)
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.
Word family
VERB
ADJECTIVE
Domain
- Exam level
- CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.C1 AdvancedIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.7.0–8.0TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 5.0–5.595–113TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.945–990
- Frequency
- Frequent
- Level
- C1 · Advanced
- Updated
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QR code
englishreference.com/q/fathom