capacious

Having a lot of space inside; roomy.

I turnd my thoughts, and with capacious mind / Conſiderd all things viſible in Heav'n

‘There’s rummer things than women in this world though, mind you,’ said the man with the black eye, slowly filling a large Dutch pipe, with a most capacious bowl.

Capable, able.

[T]he fresh brave school-life, so full of games, adventures, and good fellowship, so ready at forgetting, so capacious at enjoying, so bright at forecasting, outweighed a thousandfold their troubles with the master of their form, and the occasional ill-usage of the big boys in the house.

As you will read, Trump himself has a capacious understanding of his power.