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Adjective: hard-ass  'haard,as
Usage: N. Amer, informal
  1. (of a person) tough and uncompromising
    "The new coach's hard-ass approach to training improved the team's performance but made him unpopular with some players"
Noun: hard-ass  'haard,as
Usage: N. Amer, informal
  1. A tough and uncompromising person
    "The negotiator's reputation as a hard-ass made the other side nervous about reaching a deal";
    - hard nut [Brit, informal]

Derived forms: hard-asses