"Fortitudinous" is an adjective that means to have great strength and courage. There are several synonyms that can be used to showcase this attribute, such as resilient, sturdy, durable, fearless, brave, resolute, tenacious, unyielding, indomitable, and persevering. These words carry the same spirit of strength and bravery, depicting someone who is determined, tough, and unshaken in the face of challenges. Having fortitudinous qualities is admirable, and using these synonyms can paint a powerful and inspiring picture of someone who never gives up and faces obstacles head-on with unwavering bravery and endurance.