Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun cast-iron

1 sense of cast iron

Sense 1
cast iron -- (an alloy of iron containing so much carbon that it is brittle and so cannot be wrought but must be shaped by casting)
       => iron, Fe, atomic number 26 -- (a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood)

Antonyms of adj cast-iron

1 sense of cast-iron

Sense 1
cast-iron, iron -- (extremely robust; "an iron constitution")

INDIRECT (VIA robust) -> frail -- (physically weak; "an invalid's frail body")

Similarity of adj cast-iron

1 sense of cast-iron

Sense 1
cast-iron, iron -- (extremely robust; "an iron constitution")
       => robust (vs. frail) -- (sturdy and strong in form, constitution, or construction; "a robust body"; "a robust perennial")