English Reference

Word

innermost

Phoneticsin·ner·most, stress on the first syllable

US/ˈɪnɝˌmoʊst/

UK/ˈɪnəmˌəʊst/

Definition

adj. the most inside or closest to the center of something. You use this to describe the part that is hidden or protected by other layers.

adj. the most internal or central part of a structure or group. Often used to describe the deepest layer of a physical object or the most private aspect of a person's thoughts.

Examples

“The innermost part of the tree is very hard.”

“The explorers reached the innermost chamber of the cave, where the air was thick with ancient dust.”

“The poet's innermost fears were revealed in the final stanza, where he confessed his deepest insecurities to the reader.”

Examples

simple

“The innermost part of the tree is very hard.”

contextual

“The explorers reached the innermost chamber of the cave, where the air was thick with ancient dust.”

complex

“The poet's innermost fears were revealed in the final stanza, where he confessed his deepest insecurities to the reader.”

Real-World Examples

“Mars' innermost moon, Phobos, has puzzled planetary scientists for decades.”
ScienceDaily 19 Sept 2026
“Mercury is the least studied of the four rocky, innermost planets in our solar system, which include Venus, Earth and Mars.”
Phys.org 5 Sept 2026

Etymology

From Middle English innermost, innermest, in-nermast, alteration (due to Middle English inner, innere (“inner”)) of Old English innemest (“innermost”), equivalent to inner + -most.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Word family

ADJECTIVE

DETERMINER

This entry

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.B2 FirstIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.5.5–6.5TOEFL 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: 4.0–4.572–94TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.785–944
Frequency
Occasional
Level
B2 · Upper Intermediate
Updated

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