Cráiteachán

n.

Heard in Waterford

A miserable person, often one who constantly feels persecuted, although the existent identity of the tormentor is not always apparent.

In use

Don't bother trying to cheer her up, she's a right cráiteachán anyway

Posh English

Do not trouble yourself attempting to cheer her up, she is a persistently miserable sort in any case.