GRE TOEFL uncharted Definition Not yet explored, mapped, or understood. Example "They ventured into the uncharted waters of the southern ocean." Sign in to save GRE Quiz → TOEFL Quiz → ← uncanny unconditional → Study tips featuring "uncharted" Write GRE Words Into Your Own Sentences TOEFL Academic Vocabulary: Study by Topic Related words GRE swill GRE taper GRE testy GRE abacus SAT abase GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate SAT abdomen GRE abduct