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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"
By Princeton University
Word of the day
tetrahydric
- Noting a compound containing four replaceable hydrogen atoms. acids or alcohols, containing four replaceable atoms of hydrogen.