Wiktionary
a. (context Ireland English) corrupt, underhanded. n. 1 (context archaic English) usury. 2 (context historical Ireland English) A moneylender during the (w Great Famine (Ireland) Great Famine). 3 (context Ireland slang English) A mean, underhanded, corrupt person. Usually applied to politicians.
Usage examples of "gombeen".
They paced to the tempo of his thoughts that grieved over his ladies having to return without the finery they had been refused by a gombeen man.
Only last week he had parted with his own precious library of priceless books to a Waterford gombeen man.
From the corners of her eye she saw the crimson cloak tossed to Darcey Lubey, the elegant son of the gombeen man.
Niall your fucking Welcome Wagon March, the rage of Kilmorgan, the pale Gombeen Man.
And the Howards seemed to be polished, accomplished people, with none of that gombeen smugness he had expected.
Some gombeen with a torch stumbles onto the arsonist at work, and in the process manages to make the officer in charge--himself, as it happened--look like a totally incompetent gobshite.