English Words: U

23,789 words · Page 115 of 476

Undecembername

Alternative form of Undecimber.

undecemvirnoun

Misspelling of undecimvir.

undecemviratenoun

Alternative form of undecimvirate.

undecencynoun

Obsolete form of indecency.

undecenenoun

Any unsaturated aliphatic hydrocarbon that has eleven carbon atoms and one double bond, but especially 1-undecene

undecennaryadj

Once every eleven years; undecennial.

undecennialadj

Occurring or observed every eleventh year.

undecenoatenoun

Any salt or ester of undecenoic acid.

undecentadj

Not decent; indecent.

undecentlyadv

Unsuitably; improperly.

undecentralizedadj

Not decentralized.

undeceptionnoun

The point of being undeceived or freed from a misconception.

undeceptiveadj

Not deceptive.

undeceptivelyadv

In an undeceptive manner.

undecetnoun

A group of eleven musicians; a piece of music written for such a group

undechorionatedadj

Not dechorionated

undecidabilitynoun

the state of being undecidable.

undecidableadj

Incapable of being algorithmically decided in finite time. For example, a set of strings is undecidable if it is impossible to program a computer (even one with infinite memory) to determine whether or not specified strings are included.

undecidablyadv

In an undecidable manner.

undecideverb

To reverse or go back on (a previous decision).

undecidedadj

Open and not yet settled or determined.

undecidedlyadv

in an undecided manner

undecidednessnoun

The quality of being undecided.

undecidualizedadj

Not decidualized

undeciduousadj

Not deciduous

undecillionnum

10³⁶.

undecillionthadj

The ordinal form of the number undecillion

undecimalizedadj

Not decimalized.

undecimarticulateadj

Having eleven joints.

undecimatedadj

Not decimated.

Undecimbername

A fictitious thirteenth month of the Western calendar.

undecimvirnoun

Any member of a group of eleven officials.

undecimviratenoun

A group of eleven people, especially (politics) a council of eleven men sharing office or power and particularly (historical) the groups of eleven magistrates in ancient Athens.

undecipherverb

To decipher.

undecipherableadj

Not easily deciphered; difficult to read.

undecipherablyadv

In an undecipherable manner.

undecipheredadj

Not deciphered.

undecipheringadj

That does not decipher.

undecisionnoun

Archaic form of indecision

undecisiveadj

Alternative form of indecisive.

undecisivelyadv

Alternative form of indecisively.

undecisivenessnoun

Alternative form of indecisiveness.

undeckverb

To remove ornaments from; to strip.

undeckedadj

Having no deck.

undeclaimedadj

Not declaimed.

undeclamatoryadj

Not declamatory.

undeclarableadj

Not declarable

undeclarationnoun

The act of undeclaring something previously declared.

undeclareverb

To reverse the process of declaring; to unsay.

undeclaredadj

Not declared

Spelling & Dictionary Insight

The English alphabetical index for the letter U contains 23,789 headwords drawn from our Wiktionary-derived dictionary table. At 50 entries per page the browse splits into 476 pages, and you are currently viewing page 115. Every row above is a dictionary-backed entry with a canonical slug, and each links through to a full definition page with pronunciation, senses, etymology, and related-word data where available.

On this page 50 of 50 entries carry a part-of-speech tag and 50 carry at least one stored definition. Coverage varies across letters because Wiktionary volunteers build entries at different speeds for different parts of the alphabet, letters with common starting sounds (S, C, T, P) usually have the densest coverage, while less frequent starters (X, Q, Z) tend to have shorter but more specialised lists. PlainSpell surfaces whatever data is present and links back to the source when a definition is not yet recorded.

For readers using this index as a spelling reference, the guarantee is that every form you see on the list is a documented English headword, not a guess, not a derived inflection lacking a lemma row. If a word you expected to find is absent from the "U" list, it usually means the form exists only as an inflection of another lemma (e.g. a past participle stored under the infinitive) or the entry has not yet been imported from Wiktionary. Use the search bar or the misspelling lookup to resolve these cases.