herculean

adjectives

displaying superhuman strength or power
"herculean exertions"
herculean, powerful
is derived from
Hercules
extremely difficult; requiring the strength of a Hercules
"a herculean task"
herculean
is derived from
Hercules
is similar to
not easy; requiring great physical or mental effort to accomplish or comprehend or endure
"a difficult task"; "nesting places on the cliffs are difficult of access"; "difficult times"; "why is it so hard for you to keep a secret?"
difficult, hard