seriouson Basic wordsalso onCEFR Intermediate (B1)? CEFR Upper intermediate (B2)? CEFR Advanced (C1)? Band 2 (BND2)? Band 3 (BND3)? 严肃的,严重的,庄重的,认真的 seriousness seriousness(noun) 严肃,严重性,认真 serious serious(adjective) 严肃的,严重的,庄重的,认真的 seriously seriously(adverb) 严肃地,严重地,认真地 Forms nounadjectiveadverb seriousness serious seriously