unprecedented/ʌnprésədentid/adj. never having happened or existed in the past
unpredictable/ʌ`npri:díktəbl/adj. changing so much that you do not know what will happen next
unprofitable/ʌ`nprɑ'fitəbl/adj. not making a profit
unrivaled/ənraívəld/adj. having no equal; better than any others
unsolicited/ʌ`nsəlísitid/adj. not asked for
unstable/ʌnstéibl/adj1. not firm and therefore not strong, safe, or likely to last
adj2. An unstable person suffers from sudden and extreme changes of mental state
unsteady/ʌnstédi/adj. moving or changing, or not firm
unsuitable/ʌnsú:təbl/adj. not acceptable or right for someone or something
untidy/ʌntáidi/adj. not neat or well arranged
unusual/ʌnjú:ʒ(ə)l/adj. different and not ordinary, often in a way that is interesting
unveil/ʌnvéil/v. to make something secret known
unwavering/ʌnwéiv(ə)riŋ/adj1. never changing or becoming weaker
adj2. never moving or looking away from something
unwilling/ʌnwíliŋ/adj. not wanting to do something
up in the airuncertain and with an unknown result
up toless than or equal to, but not more than, a stated value, number, level, or time
up-to-date/ʌ`ptədéit/adj. modern, and using the most recent technology or knowledge
upcoming/ʌ'pkʌ`miŋ/adj. happening soon
update/ʌ'pdeit/n. a new form of something that existed at an earlier time
v, to add new information
upgrade/ʌ'pgreid/v. to get something that is newer and better
upheaval/ʌ`phí:vəl/n. (a) great change, causing or involving difficulty or trouble
upright/ʌ'pràit/adj. straight up or vertical
upscale/ʌ`pskéil/adj. characteristic of or suitable for the wealthy
upset/ʌpsét/adj. sad or worried because something bad has happened
v1. to make someone feel sad or worried
v2. to cause problems for something
upsetting/ʌ`psétiŋ/adj. making you sad or worried
upside/ʌ'psaid/n. the positive part of a situation