Definitions:

1. an involuntary intake of breath through a wide open mouth noun
   • Your yawning is contagious.
2. gaping open as if threatening to engulf someone or something adjective
   • The yawning mine shaft was pitch black.
3. showing lack of attention or boredom adjective
   • The teacher tried a new subject to wake the yawning class.
4. with the mouth wide open indicating boredom or sleepiness adjective
   • We put the yawning toddler to bed.

Synonyms:

• drowsy
• yawn