The president made a huge blunder and he tried to cover it up, but it backfired.
The appearance of fault is a huge blunder on our family. At least do not have the appearance of fault.
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 しつ gets shortened to しっ, though, so make that blunder.