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Meaning of hard as a rock | Babel Free

Adjective CEFR C2

Definitions

Very hard (tough, inflexible); rock hard.

not-comparable

CEFR level

C2

Mastery
This word is part of the CEFR C2 vocabulary — mastery level.

See also

hard as brazil hard as Chinese algebra hard as iron hard as nails hard as the nether millstone hard determinist