unless. See [WITHOUT].
unwell, owing to its common euphemistic application, should not be used for “ill.”
up: In general the word up, used in such a phrase as “Open up” or “He opened up his sermon with a parable” is redundant and should be omitted. Compare [OPEN].
up against it: A colloquial expression used as the equivalent of “face to face with” some condition or thing, usually of a discouraging or disastrous character. Though common in commercial circles it is an expression that it is best to avoid.
upon: Often used for on in such phrases as “call upon,” whether meaning visit or summon and “speak (or write) upon.” The reasonable tendency now is to use the simpler on whenever the idea of superposition is not involved.
usage. Compare [HABIT].
use: This word is used in all sorts of incorrect and inelegant ways; yet the conjugation of the verb is positive and very simple—use; used; using. There appears to be no difficulty in applying it affirmatively but when used in a negative form one often hears such uncouth expressions as “You didn’t use to,” “you hadn’t used to” instead of “You used not to,” etc. It need scarcely be said that these expressions are vulgarisms of the worst type. “I usedn’t to” is not pretty, but is less formal than “I used not to,” and can not be objected to on grammatical grounds.
usually. Compare [COMMONLY].
utter as a verb should be distinguished from say, as articulate expression is differentiated from written. To utter, save in the legal sense, is to emit audibly. Adjectively the word can be used only in an unfavorable sense for “complete.” Utter discord there may be, but not utter harmony; utter silence, but not utter speech.