nojo

noun : to be lacking in mojo

<insert name here> was feeling a bit low, lacking his/her usual joie-de-vivre and generally suffering from nojo

As she handed round the vol-au-vents, the concerned hostess noticed a forlorn guest standing at the side of the room, glass empty, staring vacantly into space and murmured to her friend 'I'm worried that 'X' is suffering from acute nojo'.