Nebulous [neb·u·lous] adj.
1. Lacking definition or definite content.
2. Lacking definite form or limits; vague.
Love is an abstract noun, something nebulous.
And yet love turns out to be the only part of us that is solid,
as the world turns upside down and the screen goes black.
We can’t tell if it will survive us.
But we can be sure that it’s the last thing to go.
— Martin Amis