Example : The very capaciousness of the idea meant that agreement on fundamentals was unnecessary.
His unselfishness gave him great intellectual roominess.

Synonyms : roominess

Example : The capaciousness of Santa's bag astounded the child.
Roominess in this size car is always a compromise.
His new office lacked the spaciousness that he had become accustomed to.

Synonyms : commodiousness, roominess, spaciousness