primordial

Primordial, an adjective, describes something that has been around forever, like cockroaches.

Primordial comes from the Latin words primus, meaning "first" and ordiri, "to begin." So it is easy to see that this adjective means "first of all, original." When something is primordial, it has existed since the earliest time, like the primordial mud some scientists believe was the source of all life on Earth. Remember that is it a scientific term — don't call your teacher primordial just because she's been teaching at your school since it opened.

Definitions of primordial
  1. adjective
    having existed from the beginning; in an earliest or original stage or state
    primordial matter”
    primordial forms of life”
    synonyms: aboriginal, primaeval, primal, primeval
    early
    at or near the beginning of a period of time or course of events or before the usual or expected time
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