With a protruding or jutting lower jaw.(adjective)
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Use "lantern-jawed" in a sentence
"Radcliffe may be a lantern-jawed 22-year-old leading man, and Watson a 21-year-old fashion maven, but the memory of those schoolkid personas – owlish and goody-two-shoes respectively – will stick around for ever."
"Although he has his mother's blue Irish eyes, in every other respect he's the bald-headed, lantern-jawed, moustachioed image of his late father: the character actor Lionel Jeffries, who also directed the classic 1970 film The Railway Children."
"And in still photos, he looked a bit awkward, lantern-jawed, his features all at not quite the right angles to one another."