This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. The ぱ at the end is the only tricky part here since that isn't a common reading (or the one you learned before) for the kanji. Just think of your ol' Pa (ぱ), who is the biggest half-asser you know.
My life may be incomplete, but I would never dream of joining the mafia.