adjective

• not easy; requiring great physical or mental effort to accomplish or comprehend or endure
  "a difficult task"
• dispassionate
  "took a hard look"
• resisting weight or pressure
• produced without vibration of the vocal cords
  "unvoiced consonants such as `p' and `k' and `s'"

adjective satellite

• very strong or vigorous
  "strong winds"
• characterized by effort to the point of exhaustion; especially physical effort
  "worked their arduous way up the mining valley"
• given to excessive indulgence of bodily appetites especially for intoxicating liquors
  "a hard drinker"
• being distilled rather than fermented; having a high alcoholic content
  "hard liquor"

adverb

• with effort or force or vigor
  "the team played hard"
• with firmness
  "held hard to the railing"
• earnestly or intently
  "thought hard about it"
• causing great damage or hardship
  "industries hit hard by the depression"