Chapter Umbrosity to Un- of U by Webster's Dictionary (1913 Edition)

Unendurable
 Un-English
 Unentire
 Unenviable
 Unenvious
 Unepiscopal
 Unequible
 Unerrable
 Unescapable
 Unevangelical
 Uneventful
 Unevident
 Unexact
 Unexaminable
 Unexceptionable
 Unexclusive
 Unexemplary
 Unexempt
 Unexhaustible
 Unexistent
 Unexpectable
 Unexpectant
 Unexplainable
 Unexpress
 Unexpressible
 Unexpugnable
 Unextinct
 Unfactious
 Unfadable
 Unfain
 Unfamiliar
 Unfamous
 Unfashionable
 Unfast
 Unfatherly
 Unfathomable
 Unfaulty
 Unfearful
 Unfeasible
 Unf
 Unfelicitous
 Unfelt
 Unfeminine
 Unfermentable
 Unfestival
 Unfine
 Unfleshy
 Unfluent
 Unforcible
 Unfordable
 Unforeknowable
 Unforeseeable
 Unforgetful
 Unforgivable
 Unformal
 Unframable
 Unfraternal
 Unfriable
 Unfrightful
 Unfrustrable
 Unfull
 Ungainable
 Ungainful
 Ungallant
 Ungenial
 Ungenteel
 Ungentle
 Ungentlemanlike
 Ungentlemanly
 Ungeometrical
 Unghostly
 Unglad
 Ungodlike
 Ungood
 Ungoodly
 Ungorgeous
 Ungrammatical
 Ungrave
 Unguidable
 Unguilty
 Unhabile
 Unhabitable
 Unhale
 Unhandy
 Unhardy
 Unharmful
 Unhasty
 Unhazardous
 Unhealable
 Unhealthful
 Unhealthy
 Unheavenly
 Unheedful
 Unhelpful
 Unheritable
&colbreak;

Unhigh 
Unhonorable 
Unhopeful 
Unhostile 
Unhurt 
Unhhurtful 
Unhygienic 
Unideal 
Unidle 
Unillusory 
Unimaginable 
Unimaginative 
Unimmortal 
Unimplicit 
Unimportant 
Unimpressible 
Unimpressionable 
Unimprovable 
Unipugnable 
Unincidental 
Unincrasable 
Unindifferent 
Unindulgent 
Unindustrious 
Uninflammable 
Uninfluential 
Uningenious 
Uningenuous 
Uninhabitable 
Uninjurious 
Uninquisitive 
Uninstructive 
Unintelligent 
Unintelligible 
Unintentional 
Uninteresting 
Uninterpretable 
Uninventive 
Uninvestigable 
Unjealous 
Unjoyful 
Unjoyous 
Unjustifiable 
Unkingly 
Unknightly 
Unknotty 
Unknowable 
Unlaborious 
Unladylike 
Unlevel 
Unlibidinous 
Unlightsome 
Unlimber 
Unlineal 
Unlogical 
Unlordly 
Unlosable 
Unlovable 
Unlucent 
Unluminous 
Unlustrous 
Unlusty 
Unmaidenly 
Unmakable 
Unmalleable 
Unmanageable 
Unmanful 
Unmanlike 
Unmanly 
Unmarketable 
Unmarriable 
Unmarriageable 
Unmarvelous 
Unmasculine 
Unmatchable 
Unmatronlike 
Unmeek 
Unmeet 
Unmelodious 
Unmendable 
Unmentionable 
Unmercenary 
Unmerciable 
Unmeritable 
Unmerry 
Unmetaphorical 
Unmighty 
Unmild 
Unmilitary 
Unmindful 
Unmingleable 
Unmiraculous 
Unmiry 
Unmitigable 
Unmodifiable 
Unmodish 
Unmoist 
Unmonkish 
Unmotherly 
Unmuscular 
Unmusical 
Unmysterious 
Unnamable 
Unnative 
Unnavigable 
Unneedful 
Unnegotiable 
Unniggard 
Unnoble 
Unobjectionable
&colbreak;

—— and the like.

(c) To present particles which come from intransitive verbs, or are themselves employed as adjectives, to mark the absence of the activity, disposition, or condition implied by the participle; as, -

—— and the like.

The above classes of words are unlimited in extent, and such compounds may be formed by any writer or speaker at will from almost all the adjectives or participles in the language, excepting those which have a recognized and usual negative correspondent with the prefix -in. No attempt will be made, therefore, to define them all in this Dictionary; many will be omitted from its Vocabulary which are negations of the simple word, and are readily explained by prefixing a not to the latter. Derivatives of these words in -ly and -ness will also, for the most part, be omitted for the same or similar reasons.

There will be inserted as separate articles with definitions, the following: —

1. Those which have acquired an opposed or contrary, instead of a merely negative, meaning; as, unfriendly, ungraceful, unpalatable, unquiet, and the like; or else an intensive sense more than a prefixed not would express; as, unending, unparalleled, undisciplined, undoubted, unsafe, and the like.

2. Those which have the value of independent words, inasmuch as the simple words are either not used at all, or are rarely, or at least much less frequently, used; as, unavoidable, unconscionable, undeniable, unspeakable, unprecedented, unruly, and the like; or inasmuch as they are used in a different sense from the usual meaning of the primitive, or especially in one of the significations of the latter; as, unaccountable, unalloyed, unbelieving, unpretending, unreserved, and the like; or inasmuch as they are so frequently and familiarly used that they are hardly felt to be of negative origin; as, uncertain, uneven, and the like.