Fromobligatory +‎-ly.

obligatorily (comparativemoreobligatorily,superlativemostobligatorily)

1. In anobligatory manner.

   Synonym:obligately

   Near-synonyms:necessarily;mandatorily;imperatively;(sometimes)by nature

   • 2016, Justin O. Schmidt,The Sting of the Wild, Johns Hopkins University Press,→ISBN, page56:

     In essence, we evolved defenses that rendered us nearly invincible and allowed us to becomeobligatorily social.

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