persistent
persist + -ent
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adjective
1. continuing firmly or obstinately in a course of action in spite of difficulty or opposition:
〈人･行為が〉 «…に» 固執している «in» ; しつこい, ねばり強い, 頑固な
e.g. one of the government's most persistent critics.
2. continuing to exist or endure over a prolonged period:
〈望ましくない状態が〉(通常より長く)継続している, (必要以上に)長続きする; 繰り返して起こる
e.g. persistent rain will affect many areas
e.g. persistent reports of human rights abuses by the military.
(of a chemical or radioactivity) remaining within the environment for a long time after its introduction:
e.g. PCBs are persistent environmental contaminants.
3. Botany & Zoology (of a part of an animal or plant, such as a horn, leaf, etc.) remaining attached instead of falling off in the normal manner.