hard as a rock
adjective
Roget 323:
hard,
rigid,
stubborn,
stiff,
firm;
starch,
starched;
stark,
unbending,
unlimber,
unyielding;
inflexible,
tense;
indurate,
indurated;
gritty,
proof.
adamant,
adamantine,
adamantean†;
concrete,
stony,
granitic,
calculous,
lithic†,
vitreous;
horny,
corneous†;
bony;
osseous,
ossific†;
cartilaginous;
hard as a rock
etc.
n.;
stiff as buckram,
stiff as a poker;
stiff as starch,
stiff as as board.
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