hard as a rock

adjective

Very hard (tough, inflexible); rock hard.

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Meanings

adjectivehard as a rock (not comparable)
  1. not comparablesimileVery hard (tough, inflexible); rock hard.
Cite this entry
APA

hard as a rock. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/hard%20as%20a%20rock

MLA

“hard as a rock.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/hard%20as%20a%20rock. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “hard as a rock,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/hard%20as%20a%20rock.

Source: hard as a rock on Wiktionary, CC BY-SA 4.0.