perennial - definition and synonyms

adjective 

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/pəˈreniəl/
  1. 1
    always existing, or never seeming to change

    Money is a perennial source of disagreement among couples.

    The Wizard of Oz is a perennial favourite with children.

  2. 2
    biology a perennial plant lasts for more than two growing seasons

derived word

perennially

adverb

They are perennially in debt.