The best replacement for ephemeral is intermittent.

The best alternatives to ephemeral are rated as following:
★★★★★  intermittent
★★  perennial
★★  evanescent
★★  ethereal
★  static binding
  ebs

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No companions for ephemeral have been suggested so far.
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Google Trends

Scale is based on the average worldwide traffic of ephemeral in all years. Click on graph for more.
ephemeral
intermittent
perennial