A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

U

UN
no need to spell out United Nations, even at first mention

uncooperative

underage

underestimate, understate
take care that you don’t mean overestimate or overstate (we often get this wrong)

under way
not underway

uninterested
means not taking an interest; not synonymous with disinterested, which means unbiased, objective

unmistakable

up to date
but in an up-to-date fashion

US
for United States, not USA; no need to spell out, even at first mention; America is also acceptable

U-turn