"uncompromising," 1958, originally in reference to Soviet communist policies, from the noun phrase (see hard (adj.) + line (n.)) in the political sense. Related: Hard-liner (1963).
a hard-line policy
hardener
hard-fought
hard-headed
hard-hearted
hardihood
hard-line
hardly
hardness
hard-nosed
hard-on
hardscrabble
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