Meaning of 常識欠 in Japanese

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Definition of 常識欠

あくび(akubi) · けんしん(kenshin) 【欠伸 ·欠】

(n) yawn; yawning (and stretching)
あの先生の講義はあくびが出る。
His lectures are terribly boring.
kanji "yawning" radical (radical 76)

じょうしき(joushiki) 【常識】

(n) common sense; good sense; common knowledge; general knowledge; common practice; accepted practice; social etiquette
彼女には常識が欠けている。
She is lacking in common sense.

けつ(ketsu) 【欠 ·缺】