Onerous

9 clues
Heavy
Wearing
Weighty
Demanding
Sisyphean
Burdensome
Oppressive
Troublesome
A tough row to hoe
Similar answers:
Aaroneckhart
Abalone
Abalones
Abalonesandwich
Abalonetexas
Abandoned
Abandonedsheep
Abandonedship
Abandonedshipit
Abandonedwell
Abandonee
Abandonees
Abandononespost
Abone
Aboner
Aboneto
Aboutfindsabone
Aboutonebillion
Abovementioned
Aboveoneself