ARDUOUS, ARDUOUSNESS
ADJECTIVES
1808 ► KNEEF → NEEF arduous, difficult → Sc. obs.
1890 ► HELL-BENDING arduous, hellish → Amer. sl.
NOUNS
1623 ► ARDUITY arduousness; steepness; arduousness; difficulty → obs.
1911 ► BEAR something particularly arduous or challenging → Amer. sl.
1920 ► WHIZ BITCH anything arduous or very disagreeable → sl.
1949 ► HELL-BUSTER something extremely arduous or difficult → Amer. dial.
1961 ► ASS-BREAKER an arduous or agonizing task, experience, etc. → Amer. sl.
Lexicophilia 