In Latin, the gerundive is used in place of the gerund in constructions where the gerund would take a direct object. The gerundive is constructed just as the gerund would be, but where the gerund is always neuter singular, the gerundive agrees with its object in case, number, and gender; the object of the gerundive then takes the intended case of the gerund.
For example (my apologies for the missing macrons):
causa simulandi, a gerund construction meaning "for the purpose of deceiving," becomes the gerundive construction causa simulandorum virorum, "for the purpose of deceiving the men," when the direct object "men" is given to the verbal "deceiving."
The other gerund constructions parallel the above with rare exceptions.