stone, gem, precious stone, milestone, hailstone, anything hard, troublesome or intolerable, tombstone, epitaph, rock, unmarried daughter

to become stone, to be petrified, to become hard as stone, to become rigid, to be heavy or burdensome, to be unmerciful, to receive no impression, to be impervious (to), to be fixed or immovable, to be still as a statue, be stable, stand still

firelock, musket

merciless

merciless

coal, rock coal

a difficult task to become easy

helplessness

be hard-hearted, cruel

become helpless due to hardships

a cruel have no pity

a hard-hearted person to soften

a hard heart

(Metaphorically) hard hearts never melt

hard hearts never melt, refers to someone who is impervious to advice or appeal

stone-hearted, hard-hearted, merciless

one who plays at stone-throwing, one who is fond of, or is addicted to, throwing stones

stone-cutter, lapidary

a woodpecker, one who breaks stone, quarryman

the plant Plectranthus aromaticus

a kind of serpent

be impervious, be ruined, to fall into a misfortune, be successful, to hall

(curse) may it be ruined! may it be crushed under stone!

a difficult poetic metre

stone-throwing, fondness for stone-throwing

take pains

firelock, musket

stoning