Noun
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a disloyal person who betrays or deserts his cause or religion or political party or friend etc.
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an abject coward
Adjective
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lacking even the rudiments of courage
abjectly fearful
"the craven fellow turned and ran"
"a craven proposal to raise the white flag"
"this recreant knight"- Spenser
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having deserted a cause or principle
"some provinces had proved recreant"
"renegade supporters of the usurper"