My life may be incomplete, but I would never dream of joining the mafia.
Take the middle route, half to the edge. You don't do anything the full way. Just to the middle. Just to the half. Not to the edge. This was really half finished and half assed of you.
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.