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"Hard" as an adverb means with effort or intensity; "hardly" means almost not, barely.
Side-by-side comparison
"Hard" as an adverb means with great effort or intensity. "He worked hard": he put in all his energy and dedication.
She works hard every day to support her family.
It was raining hard when we left the office.
He hit the ball hard and it went over the wall.
"Hardly" is not the adverb of "hard": it means barely or almost not at all. "He hardly worked": he barely worked. They are opposites in meaning, not synonyms.
She was so tired she could hardly keep her eyes open.
I hardly ever eat fast food anymore.
He hardly slept last night. He looks exhausted.
Common mistake
- •"I hardly work" and "I work hard" are opposites.
- •"Hardly" = barely/almost not, while "hard" as an adverb = with effort.
Trick to remember it
- •"Hard" is already an adverb: "work hard", "try hard".
- •"Hardly" exists but means "barely", the opposite meaning.
Quick rule
- •"Hard" (adv) = with effort / intensely.
- •"Hardly" = almost not / barely.
Did you know?
"Hardly" behaves grammatically like a negative, similar to "never", "barely", "scarcely", and "seldom." That is why it does not combine with "not", it would create a double negative: "I do not hardly know her" is wrong. Correct: "I hardly know her." This family of "near-negatives" shares another property: when placed at the start of a sentence, they invert subject-verb order, just like in questions. "Hardly had I arrived when the phone rang." This grammatical phenomenon, inversion after negative adverbs, is one of the most elegant and formal features of written English.
Practise what you learned
Exercise 1 · Pick the right one
She works really _____ . She is always the last one to leave the office.
Exercise 2 · Pick the right one
I _____ know anyone here. I only moved to this city last week.
Exercise 3 · Form the word
Related word pairs
"Fast" describes continuous high speed; "quick" describes brevity or a short burst of speed.
"Fast" is both adjective and adverb; "quickly" is only an adverb and sounds more formal.
Both mean "not easy", but "hard" also means physically firm or working intensely.
"Late" means behind schedule or at an advanced hour; "lately" means recently or in recent times.
Bryan López
Founder of SpeakUP Academy