The phrase "unspeakable joy" means a type of happiness that is so intense and overwhelming that it is difficult to put into words or describe. Full definition
The weeks that followed were filled with unspeakable joy and wonder accompanied by sleepless nights, massive mood swings and the overwhelming feeling that I had no idea what I was doing and I was failing at all of it. (noguiltmom.com)
If you just explore God's will for your life a bit, you will soon discover unspeakable joy and peace without measure. (redeeminggod.com)
Then the babe smiles, Then my girl sings, Then I hug my boys, Oh, nobody told me that these crazy days Held such unspeakable joys! (thenaturalmommy.com)