しらみつぶしじゃなかったです
虱潰しじゃなかったです
shiramitsubushijanakattadesu

Noun
Desu Copula

The polite, past negative form of しらみつぶし

1. Didn't exterminate lice.; Didn't get rid of lice.

Past/Perfective
Negative
Polite
Casual Register
Usually Written in Kana