If something is inevitable, it will definitely happen, like death or tax season.

Inevitable comes from the Latin word inevitabilis, which means unavoidable. If you say something is inevitable, you give the sense that no matter what scheme you come up with to get around it, it's going to happen sooner or later. You can use all the skin products you want, but wrinkles are inevitable.

Definitions of inevitable
  1. adjective
    incapable of being avoided or prevented
    “the inevitable result”
    fatal, fateful
    controlled or decreed by fate; predetermined
    ineluctable, inescapable, unavoidable
    impossible to avoid or evade:"inescapable conclusion"
    unavoidably determined by prior circumstances
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    avertable, avertible, avoidable, evitable
    capable of being avoided or warded off
  2. adjective
    invariably occurring or appearing
    “the inevitable changes of the seasons”
    capable of being foretold
  3. noun
    an unavoidable event
    “don't argue with the inevitable
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    type of:
    destiny, fate
    an event (or a course of events) that will inevitably happen in the future
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