Plural of depravity; instances or types of extreme moral corruption, wickedness, or vice.
From depravity (noun) + -ies (irregular plural of -y nouns). Nouns ending in -y change it to -ies in plural form, as in 'lady/ladies' or 'baby/babies.'
The -y to -ies plural rule is one of English's strictest—almost no exceptions—because it evolved from the Old English feminine noun endings centuries ago.
Complete word intelligence in one call. Free tier — 50 lookups/day.