Potential answers for "Hardly frivolous"

⭐⭐⭐⭐ SOBER
⭐⭐ SAL
⭐⭐ EARNEST
⭐⭐ STAID
⭐⭐ SILLY
⭐⭐ FLIP
⭐⭐ IDLE
⭐⭐ TRIFLER
⭐⭐ NONONSENSE

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