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persistent US English

Continuing firmly or obstinately in a course of action in spite of difficulty or opposition

persistent US Thesaurus

a very persistent man

non-persistent US English

That does not persist, especially in the course of phylogeny or ontogeny, or in the environment; (Botany) designating or relating to plant viruses that are carried only briefly and superficially on the mouthparts of insect vectors (also called non-circulative).

persistent organic pollutant US English

A hazardous organic chemical compound that is resistant to biodegradation and thus remains in the environment for a long time

persistent vegetative state US English

A condition in which a medical patient is completely unresponsive to psychological and physical stimuli and displays no sign of higher brain function, being kept alive only by medical intervention