toska
noun·/ˈtɒs.kə/
A Russian word for a deep, often unnameable anguish or yearning. Restlessness, melancholy, spiritual ache, ranging from mild ennui to soul-sick despair. Toska can be objectless: pain without a clear "because."
He felt toska in the crowd’s noise—lonely not for lack of people, but for lack of meaning.
Etymology
From Russian тоска (toská). Famous in translation lore because it names a spectrum of inward distress English usually parcels into separate words.
Related Words
ennuiboredom with melancholy; smaller in scope
saudadelonging with sweetness; toska is darker
acediaspiritual listlessness; a near cousin
weltschmerzworld-pain; a later German analogue in your list