Existing or remaining in the same state for an indefinitely long time

• persistent

  1. (Zoology) Retained permanently, rather than disappearing in an early stage of development:
  2. Remaining for life
  3. (Botany) Lasting past maturity without falling off, as the calyx on an eggplant or the scales of a pine cone.

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  1. (Zoology) Retained permanently, rather than disappearing in an early stage of development:
  2. Remaining for life
  3. (Botany) Lasting past maturity without falling off, as the calyx on an eggplant or the scales of a pine cone.

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• permanent

  1. Not expected to change in status, condition, or place:
  2. Lasting a relatively long time
  3. Lasting or intended to last indefinitely without change

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  1. Not expected to change in status, condition, or place:
  2. Lasting a relatively long time
  3. Lasting or intended to last indefinitely without change

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• perennial

  1. Lasting or active throughout the whole year
  2. Lasting an indefinitely long time; enduring:
  3. Having a life cycle of more than two years: said esp. of herbaceous plants that produce flowers and seed from the same root structure year after year

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  1. Lasting or active throughout the whole year
  2. Lasting an indefinitely long time; enduring:
  3. Having a life cycle of more than two years: said esp. of herbaceous plants that produce flowers and seed from the same root structure year after year

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• perdurable

  1. Extremely durable; permanent.

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  1. Extremely durable; permanent.

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• old

  1. Made long ago; in existence for many years:
  2. Belonging to or being of an earlier time:
  3. Having or exhibiting the physical characteristics of age:

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  1. Made long ago; in existence for many years:
  2. Belonging to or being of an earlier time:
  3. Having or exhibiting the physical characteristics of age:

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• long-standing

  1. Having continued for a long time

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  1. Having continued for a long time

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• long-lived

  1. Having or tending to have a long life span or existence

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  1. Having or tending to have a long life span or existence

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• long-lasting

  1. Persisting or enduring for a long time.

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  1. Persisting or enduring for a long time.

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• lasting

  1. Continuing or remaining for a long time; enduring:

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  1. Continuing or remaining for a long time; enduring:

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• enduring

  1. Lasting; continuing; durable:
  2. Long-suffering; patient.
  3. Lasting; permanent; durable

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  1. Lasting; continuing; durable:
  2. Long-suffering; patient.
  3. Lasting; permanent; durable

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• durable

  1. Able to perform or compete over a long period, as by avoiding or overcoming injuries:
  2. Designating a power of attorney that remains in effect after the person who authorized it becomes incompetent
  3. Made to withstand repeated use over a relatively long period, usually several years or more:

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  1. Able to perform or compete over a long period, as by avoiding or overcoming injuries:
  2. Designating a power of attorney that remains in effect after the person who authorized it becomes incompetent
  3. Made to withstand repeated use over a relatively long period, usually several years or more:

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• abiding

  1. Lasting for a long time; enduring:
  2. Continuing without change; enduring; lasting
  3. Continuing or persisting in the same state; lasting; enduring. [First attested around 1350 to 1470.]

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  1. Lasting for a long time; enduring:
  2. Continuing without change; enduring; lasting
  3. Continuing or persisting in the same state; lasting; enduring. [First attested around 1350 to 1470.]

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Of long duration

• protracted

  1. Lasting for a long time or longer than expected or usual.

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  1. Lasting for a long time or longer than expected or usual.

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• prolonged

  1. Lengthy in duration; extended; protracted.

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  1. Lengthy in duration; extended; protracted.

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• persistent

  1. (Zoology) Retained permanently, rather than disappearing in an early stage of development:
  2. Continuing to exist or endure; lasting without change
  3. Existing or remaining in the same state for an indefinitely long time; enduring:

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  1. (Zoology) Retained permanently, rather than disappearing in an early stage of development:
  2. Continuing to exist or endure; lasting without change
  3. Existing or remaining in the same state for an indefinitely long time; enduring:

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• lingering

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• chronic

  1. By habit, custom, etc.; habitual; inveterate
  2. Lasting for a long period of time or marked by frequent recurrence, as certain diseases:
  3. Of long duration; continuing:

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  1. By habit, custom, etc.; habitual; inveterate
  2. Lasting for a long period of time or marked by frequent recurrence, as certain diseases:
  3. Of long duration; continuing:

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