Definition of poltroon noun from the Oxford Advanced Learner's Dictionary
poltroon
noun
/pɒlˈtruːn/
/pɑːlˈtruːn/
(old use, disapproving)
a coward (= a person who lacks courage)
Word Origin early 16th cent.: from French poltron, from Italian poltrone, perhaps from poltro ‘sluggard’.