Potential answers for "Not prone to goofing around"

⭐⭐⭐⭐ STERN
⭐⭐⭐ ONTASK
⭐⭐⭐ ATPLAY
⭐⭐⭐ HORSING
⭐⭐⭐ GETSERIOUS
⭐⭐⭐ ANTIC
⭐⭐ IDLE
⭐⭐ OUT
⭐⭐ ABSENT

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