Qualunque / qualsiasi

Qualunque and qualsiasi describe the arbitrariness, emphasize the fact that anybody / anything can be the agent or the goal of an action. Both are adjectives and can't be used as nouns. They don't match in gender and number with the noun, there is only one form.

  He can come whenever he want.  
  Può venire a qualunque ora.
  Può venire a qualsiasi ora.
  Everybody can become sick.
  Qualunque uomo può ammalarsi .
  Qualsiasi persona può ammalarsi.

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