Depending on context, "severe" can mean unbearable, formidable, inordinate, outrageous, inflexible, oppressive, repressive, forbidding, unfriendly
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The word reversible itself is ten letters.Another possibility is palindrome.
Severe.
Breadcrumb is a 10 letter word. Chocoholic is a 10 letter word.
"Insatiable"
brutal