noun

perfect happiness; great joy.

she gave a sigh of bliss

joy,pleasure,delight,happiness,gladness,ecstasy,elation,rapture,euphoria,heaven,paradise,seventh heaven,cloud nine,utopia,Eden,Arcadia,halcyon days,days of wine and roses,the top of the world

verb

reach a state of perfect happiness, oblivious of everything else.

Josh is just blissed out, always smiling