まかせっぱなしじゃありませんでした
makaseppanashijārimasendeshita

Noun
Desu Copula

The polite, past negative form of 任せっぱなし

1. Wasn't left to do as one pleased.; Wasn't left unattended.; Wasn't left to one's own devices.

Past/Perfective
Negative
Polite
Terminal Form