Definitions of hard on the Web:

* difficult: not easy; requiring great physical or mental effort to accomplish or comprehend or endure; "a difficult task"; "nesting places on the cliffs are difficult of access"; "difficult times"; "a difficult child"; "found himself in a difficult situation"; "why is it so hard for you to keep a secret?"
* dispassionate; "took a hard look"; "a hard bargainer";
* resisting weight or pressure
* with effort or force or vigor; "the team played hard"; "worked hard all day"; "pressed hard on the lever"; "hit the ball hard"; "slammed the door hard"
* with firmness; "held hard to the railing"
* very strong or vigorous; "strong winds"; "a hard left to the chin"; "a knockout punch"; "a severe blow"
* arduous: 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"
* earnestly or intently; "thought hard about it"; "stared hard at the accused"
* unvoiced: produced without vibration of the vocal cords; "unvoiced consonants such as `p' and `k' and `s'"
* causing great damage or hardship; "industries hit hard by the depression"; "she was severely affected by the bank's failure"
* (of light) transmitted directly from a pointed light source
* slowly and with difficulty; "prejudices die hard"
* (of speech sounds); produced with the back of the tongue raised toward or touching the velum; "Russian distinguished between hard consonants and palatalized or soft consonants"
* heavily: indulging excessively; "he drank heavily"
* intemperate: given to excessive indulgence of bodily appetites especially for intoxicating liquors; "a hard drinker"
* into a solid condition; "concrete that sets hard within a few hours"
* being distilled rather than fermented; having a high alcoholic content; "hard liquor"
* very near or close in space or time; "it stands hard by the railroad tracks"; "they were hard on his heels"; "a strike followed hard upon the plant's opening"
* unfortunate or hard to bear; "had hard luck"; "a tough break"
* with pain or distress or bitterness; "he took the rejection very hard"
* dried out; "hard dry rolls left over from the day before"
* to the full extent possible; all the way; "hard alee"; "the ship went hard astern"; "swung the wheel hard left"