What is another word for really hard?

Need synonyms for really hard? Here's a list of similar words from our thesaurus that you can use instead.

Adverb
Diligently, with a lot of effort
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“I worked really hard to do everything correctly. I tested my sugars obsessively, ate balanced meals, cut out caffeine, and exercised.”
Adverb
With a great deal of force
“Experience had taught me that you do hit back, really hard, so they don't ever hit you again.”
Adjective
Having a solid or firm surface or texture
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“There is no plastic with a really hard surface. They all get scratched up in use sooner or later.”
Adjective
Involving a great deal of force
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“A part of me was convinced this whole thing was a hallucination, the product of a really hard knock to the head.”
Adjective
Very strenuous, requiring a great deal of effort
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“It's a really hard problem to solve, and solving it would require a lot of coordinated and, at times, selfless actions.”
Adjective
Intellectually hard to comprehend or resolve
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“It's a really hard problem to solve, and solving it would require lots of coordinated and at times selfless actions.”
Adjective
Cold-hearted, generally lacking in emotion
“His dad was a really hard man who never showed him any affection.”
Adjective
Very strenuous, requiring a great deal of effort
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