Fierce

adv.

Heard in Mayo, Cork, Kilkenny, Donegal, Cavan, Offaly, Roscommon, Galway, Meath, Waterford and Kildare

Used as an intensifier meaning very or exceedingly.

In use

Jayz twas fierce cowld out on de pier today la!

Posh English

Goodness me, it was terribly chilly out upon the pier today!

Same phrase, other counties