Boredom
 Tone scale

[Boredom is a tonal level.]

Quotes
"The spectator. All the world is a stage, and he's the audience. Neither contented nor discontented. He endures things.  Purposeless. Careless. Not threatening; not helpful.--Tone scale

“Work spares us from three evils: boredom, vice, and need”---- Voltaire

"Easily bored."---[2010] Psychopathic Traits by Thomas Sheridan

The cure for boredom is curiosity. There is no cure for curiosity. ---Ellen Parr