REALLY TOUGH
Definition: Extremely difficult or challenging; requiring great effort or determination.
Synonyms: Extremely Hard, Very Difficult, Seriously Challenging, Intensely Rough, Extremely Demanding
Usage Examples in Sentences
#1
Deciphering ancient hieroglyphics without a Rosetta Stone can be a really tough challenge for archaeologists.
#2
Cracking the code of an ancient unsolved cipher proves to be a really tough puzzle for cryptographers and codebreakers.
#3
To really understand quantum mechanics is tough.
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