"yawning" in the noun sense
1. yawn, yawning, oscitance, oscitancy
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 oscitancy"
"yawning" in the verb sense
utter a yawn, as from lack of oxygen or when one is tired
"The child yawned during the long performance"
2. gape, yawn, yaw
be wide open
"the deep gaping canyon"
"yawning" in the adjective sense
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"
3. drowsy, oscitant, yawning
showing lack of attention or boredom
"the yawning congregation"
Source: WordNet® (An amazing lexical database of English)
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