Future passive participle (gerundive) of gerō (“carry, bear; wear”).

gerendus (feminine gerenda, neuter gerendum); first/second-declension participle

1. which is to be carried, which is to be borne; which is to be worn

First/second-declension adjective.

• “gerendus”, in Gaffiot, Félix (1934), Dictionnaire illustré latin-français, Hachette.
• Carl Meißner; Henry William Auden (1894), Latin Phrase-Book‎^[1], London: Macmillan and Co.
  • statesmen: viri rerum civilium, rei publicae gerendae periti or viri in re publica prudentes
    
  • banished from public life: gerendis negotiis orbatus (Fin. 5. 20. 57)
    
  • to charge some one with the conduct of a war: praeficere aliquem bello gerendo
    
  • to change one's tactics: rationem belli gerendi mutare (Liv. 32. 31)