English edit

Etymology edit

From im- +‎ prosperous.

Adjective edit

improsperous (comparative more improsperous, superlative most improsperous)

  1. (obsolete) not prosperous
    • 1697, John Dryden, transl., Aeneid, book VI:
      Seven revolving years are wholly run, Since the improsperous voyage we begun.

Derived terms edit

References edit