The quality or state of being harrowing; the degree to which something is distressing or emotionally painful.
From 'harrowing' + '-ness' (Old English suffix creating abstract nouns from adjectives). This creates a noun describing the abstract quality of causing emotional distress.
English's '-ness' suffix is so productive that we can theoretically add it to almost any adjective—'harrowingness' is a perfect example of how English speakers constantly create new words by combining existing parts!
Complete word intelligence in one call. Free tier — 50 lookups/day.