From gratuitous + -ly.

• (British) IPA: /ɡɹəˈtjuː.ɪ.təs.li/, /ɡɹəˈtʃuː.ɪ.təs.li/
• (America) IPA: /ɡɹəˈtu.ə.təs.li/, /ɡɹəˈtju.ə.təs.li/

gratuitously

1. Freely; in the manner of a gift, without being earned.
   • 1854, Henry David Thoreau, chapter 1, in Walden:

     We should feed and clothe him gratuitously sometimes, and recruit him with our cordials, before we judge of him.

2. In a manner not demanded by the circumstances, without reason, justification, cause, or proof.

• French: gratuitement
• German: umsonst, unentgeltlich
• Italian: gratuitamente
• Russian: беспла́тно
• Spanish: gratuitamente

• French: gratuitement
• German: unnötigerweise, unbegründeterweise, überflüssigerweise
• Italian: gratuitamente
• Russian: неуместно
• Spanish: gratuitamente