Strghtfrwrd
straightforward
Tstng
testing
Strtch
stretched
Dlct
delicate
Tgh
tough
Grllng
gruelling
Dmndng
demanding
Trcky
tricky
Pnshng
punishing
Rgrs
rigorous
Chllng
challenging
strct
strict
Rds
arduous
Wkwrd
awkward