The Collaborative International Dictionary
Yawningly
Yawningly \Yawn"ing*ly\, adv. In a yawning manner.
Wiktionary
yawningly
adv. In a yawning way; accompanied by yawns.
Usage examples of "yawningly".
Kosic was yawningly impassive when Robbie came through the door and dropped the subpoena on his desk.
When I arrived at the Situation Room, I found only the duty officer, who yawningly informed me that the President was asleep and all was well.
Liaison officer was a job that could shift from yawningly boring to lethally demanding in an eyeblink.