Adjective
Having the mouth open; gaping; hence, greedy; clamorous.
Source: Webster's dictionary590–570 BC) LIMC Herakles 2621 (Smallwood, p. 92), seems to show a single lion-headed Cerberus, with snake (open-mouthed) over his back. Source: Internet
In 1787, she caused a minor public scandal with a self-portrait, exhibited the same year, in which she was shown smiling open-mouthed – in contravention of painting conventions going back to antiquity. Source: Internet
Ultimately, Byron got his comeuppance when he was snubbed by Claire Clairmont (Nadia Parkes) for his indiscriminate flirting, leaving him open-mouthed in the episode’s final moments. Source: Internet
By that time, she could tell from Ndege's weight and Mill's open-mouthed breathing that they were both asleep, and Dodd was on the verge. Source: Internet
Illumination with doodles and drawings (marginalia), including an open-mouthed human profile, with multiple tongues sticking out. Source: Internet
Mrs. Hall, standing open-mouthed and horror-struck, shrieked at what she saw, and made for the door of the house. Source: Internet