Definition of "Hard" :
adjective: not easy; requiring great physical or mental effort to accomplish or comprehend or endure
"Why is it so hard for you to keep a secret?."
adjective: characterized by effort to the point of exhaustion; especially physical effort
adjective: dried out
"Hard dry rolls left over from the day before."
adjective: unfortunate or hard to bear
"Had hard luck."
adjective: resisting weight or pressure
"Took a hard look."
adjective: (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."
adjective: (of light) transmitted directly from a pointed light source
adjective: being distilled rather than fermented; having a high alcoholic content
adjective: given to excessive indulgence of bodily appetites especially for intoxicating liquors
"A hard drinker."
adjective: produced without vibration of the vocal cords
adjective: very strong or vigorous
"A hard left to the chin."
adverb: with effort or force or vigor
"The team played hard."
adverb: to the full extent possible; all the way
adverb: slowly and with difficulty
"Prejudices die hard."
adverb: causing great damage or hardship
"Industries hit hard by the depression."
adverb: with firmness
"Held hard to the railing."
adverb: earnestly or intently
"Thought hard about it."
adverb: with pain or distress or bitterness
"He took the rejection very hard."
adverb: very near or close in space or time
"It stands hard by the railroad tracks."
adverb: into a solid condition
"Concrete that sets hard within a few hours."
adverb: indulging excessively