Ennui what a great word. It should be my next name. What is happiness? Something different to everyone I think. For me, I have it sometimes, more like contentment yet often fleeting.
Someone texted me something recently with a Buddha picture. It said a man told Buddha, "I want happiness." So Buddha said, "first take out 'I' for that is ego, then take away 'want' for that is desire, now see what you are left with happiness." I thought it was clever. Easier said than done.