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adj.
characterized by toilsome effort to the point of exhaustion; especially physical effort; "worked their arduous way up the mining valley"; "a grueling campaign"; "hard labor"; "heavy work"; "heavy going"; "spent many laborious hours on the project"; "set a punishing pace"
adj.
marked by imagination, initiative, and readiness to undertake new projects; "an enterprising foreign policy"; "an enterprising young man likely to go far"
adj.
making great mental demands; hard to comprehend or solve or believe; "a baffling problem"; "I faced the knotty problem of what to have for breakfast"; "a problematic situation at home"
adj.
difficult to handle; requiring great tact; "delicate negotiations with the big powers";"hesitates to be explicit on so ticklish a matter"; "a touchy subject"