TOEFL IELTS serene Definition Calm, peaceful, and untroubled; undisturbed. Example "The lake lay serene under the morning sun." Sign in to save TOEFL Quiz → IELTS Quiz → ← serendipity serenity → Study tips featuring "serene" Study the Exact Words Examiners Use Map Each Word Into a Connected Network Audit Your Own Writing for Lexical Resource Related words TOEFL brighten GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate GRE abduct SAT abet GRE abhor GRE abide SAT abject TOEFL ablaze