英文解释： adjective: not easily perturbed or excited or upset; marked by extreme calm and composure
例句： The house shook and the ground quaked, but my dad was unflappable and comforted the family.
GMAT核心词汇 unforthcoming
英文解释： adjective: uncooperative, not willing to give up information
例句： The teacher demanded to know who broke the window while he was out of the room, but the students understandably were unforthcoming.
GMAT核心词汇 unimpeachable
英文解释： adjective: free of guilt; not subject to blame; beyond doubt or reproach
例句： After his long and unimpeachable service to the company, Sharat felt that a gold watch was a slap in the face rather than an honor.
GMAT核心词汇 unnerve
英文解释： verb: to make nervous or upset
例句： At one time unnerved by math problems, she began avidly “Magoosh-ing”, and soon became adept at even combinations and permutations questions.
GMAT核心词汇 unprecedented
英文解释： adjective: having never been done or known before; novel
例句： When America first created its national parks, the idea of setting aside the most beautiful land in a country was unprecedented in the history of mankind.
GMAT核心词汇 unprepossessing
英文解释： adjective: creating an unfavorable or neutral first impression
例句： World leaders coming to meet Gandhi would expect a towering sage, and often would be surprised by the unprepossessing little man dressed only in a loincloth and shawl.
GMAT核心词汇 unpropitious
英文解释： adjective: (of a circumstance) with little chance of success
例句： With only a bottle of water and a sandwich, the hikers faced an unpropitious task: ascending a huge mountain that took most two days to climb.
GMAT核心词汇 unruly
英文解释： adjective: (of persons) noisy and lacking in restraint or discipline; unwilling to submit to authority
例句： Walk in to any preschool and I am sure that you will find an unruly and chaotic scene—unless it's nap time.
GMAT核心词汇 unscrupulous
英文解释： adjective: without scruples or principles
例句： In the courtroom, the lawyer was unscrupulous, using every manner of deceit and manipulation to secure a victory for himself.
GMAT核心词汇 unseemly
英文解释： adjective: not in keeping with accepted standards of what is right or proper in polite society
例句： He acted in an unseemly manner, insulting the hostess and then speaking ill of her deceased husband.
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