yawning

gaping open as if threatening to engulf someone or something

• “the yawning mine shaft”
• “a yawning abyss”

with the mouth wide open indicating boredom or sleepiness

• “a yawning congregation”

showing lack of attention or boredom

• “the yawning congregation”

an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom

• “he could not suppress a yawn”
• “the yawning in the audience told him it was time to stop”
• “he apologized for his ostinancy”