criminal
It's criminal to charge so much for a book.一本书要这么高的价钱，真是太不应该了。
It would be criminal to ignore her huge contribution to the project.
It's criminal that in a wealthy country like this so many people are struggling to get by.
It is borderline criminal to have classrooms sitting empty when they could be used by local communities.

SMART Vocabulary: related words and phrases

Difficult situations and unpleasant experiences
a hard/tough row to hoeidiom
abyss
adversity
at your worstidiom
Augean
bad hair day
epidemic
half nelson
hardness
have a bumpy rideidiom
pall
purgatory
push factor
quagmire
quicksand
rabbit hole
scrape
strait
the Augean Stablesidiom
the hard wayidiom