Longman Dictionary of Contemporary English homepage

impermanent

 adjective
     
im‧per‧ma‧nent formal
not staying the same for ever [= temporary; ≠ permanent]:
single-storey structures, built from cheap and impermanent materials
—impermanence noun [uncountable]
His philosophy stressed the impermanence of the world.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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