Is Four of Cups a yes or a no?

This card leans no. It carries obstruction, ending or delay, and in a straight yes/no draw most readers take it negatively.

The Four is emotional flatness. Not grief and not crisis: apathy.

Something is being offered and the figure cannot summon the interest to look at it, which is itself the information. He is not refusing the fourth cup. He has not looked up.

That distinction governs every reading of the card. Refusal is a decision and can be examined; this is the absence of enough interest to make one, and it is the condition rather than the choice that the card is describing.

Yes/no readings are the most popular use of tarot and the one it is worst suited to. A seventy-eight card deck built to describe nuance is being asked for one bit of information, and most of what it knows is discarded in the process.

A more useful version of the same draw: read Four of Cups as what shape this takes, not whether it happens. Boredom, discontent, withdrawal. An opportunity present and unnoticed.

The card puts a genuinely open question, and the tradition does not answer it for you: are you depressed, ungrateful, or genuinely right that none of this is for you? All three produce the same posture, and only the person in it can tell which.

In an advice position it asks for the smallest possible action: look at the thing properly once before deciding it is not interesting. Not enthusiasm, which is not available, and not gratitude, which cannot be manufactured. Just a look.

Reversed, the lean weakens or inverts. Coming out of it. Interest returning, the offer finally seen, appetite arriving before anybody expected it.

Or the other direction: deeper withdrawal, where a retreat has become a permanent position and the world has adjusted around it.

The first is more common and is worth reading generously. Flatness lifts of its own accord more often than anybody admits, and the card reversed frequently arrives before the person has noticed the change in themselves.