Both Uses

metaphysical
in
The Fountainhead
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The architect is a metaphysical priest dealing in basic essentials, who has the courage to face the primal conception of reality as nonreality—since there is nothing and he creates nothingness.†
Chpt 2.8 *

metaphysical = about things beyond the physical world, such as existence, reality, or the soul
Too God-damn metaphysical.†
Chpt 4.13

Definitions:

(1) (metaphysical)
relating to things beyond the physical world—such as existence, reality, God, or the soul—and sometimes to ideas that are very abstract or overly theoretical

People often use metaphysical for beliefs or questions that go beyond what can be directly tested by science—for example, beliefs about the soul, God, or what ultimately makes something real. These are usually things without material form that you cannot touch or measure.

In philosophy, metaphysical specifically refers to metaphysics, the branch of philosophy that studies being and knowing—questions like "What is real?", "Do we have free will?", or "What does it mean for something to exist?"

In everyday language, someone might call a discussion metaphysical if it feels very abstract or "off in the clouds," as in "They got lost in a metaphysical argument about whether anything is truly knowable."
(2) (meaning too rare to warrant focus)
More rarely, metaphysical can reference a 17th-century style of British poetry.