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universal of, having to do with, or characteristic of the whole world or the world's population. [2 definitions]
universe all matter and energy; all existing things, including the earth and heavens.
university a large school, where people both learn and do research. A student must finish high school before attending a university. Universities offer several levels of degrees.
unkind not kind or sympathetic; harsh.
unknown not known; not familiar.
unlawful not allowed by law; illegal.
unless except on the condition that.
unlike not alike or equal; different; unequal. [3 definitions]
unlimited having no limits, bounds, or restrictions.
unload to remove the load from. [3 definitions]
unlock to open the lock of by turning a key or mechanism. [3 definitions]
unlucky marked by or involving ill fortune or bad luck. [2 definitions]
unmanned not having a human pilot or crew.
unnatural not according to natural laws or processes. [2 definitions]
unnecessary not needed or required.
unpack to take out of a package, suitcase, or container. [2 definitions]
unpleasant not pleasant or agreeable; distasteful.
unpopular not liked or approved of by many people.
unravel to undo; reduce from cloth to threads; cause to come apart. [3 definitions]
unreasonable not acting or behaving with good sense; not guided by good judgment or sound thinking. [2 definitions]
unreliable not able to be relied on.