yawning
1. [ adjective ] gaping open as if threatening to engulf someone or something
Examples:

"the yawning mine shaft" "a yawning abyss"

Related terms: open
2. [ noun ] (biology,medicine) an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom
Synonyms: yawn oscitancy oscitance
Examples:

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

Related terms: reflex inhalation pandiculation yawn
3. [ adjective ] with the mouth wide open indicating boredom or sleepiness
Examples:

"a yawning congregation"

Related terms: open
4. [ adjective ] showing lack of attention or boredom
Synonyms: oscitant drowsy
Examples:

"the yawning congregation"

Related terms: inattentive