Potential answers for "Least frivolous"

⭐⭐⭐⭐ XXXXXXXX
⭐⭐⭐ NONONSENSE
⭐⭐⭐ STAIDEST
⭐⭐ SAL
⭐⭐ EARNEST
⭐⭐ STAID
⭐⭐ SILLY
⭐⭐ FLIP
⭐⭐ IDLE

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