A dishonorable or unprincipled person; a scoundrel or rogue.
From Spanish 'canalla,' of uncertain origin, possibly related to Latin 'canis' (dog), implying beastlike behavior. Used in English primarily in historical or literary contexts.
Canalla is delightfully specific—it captures the Spanish cultural concept of a person not just bad but dishonored, lacking the dignity deserving of respect. You don't see it much in modern English, which is a shame.
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