TOEFL boundless Definition Without limits or constraints; infinite. Example "Her enthusiasm for space exploration is boundless." Sign in to save TOEFL Quiz → ← boundary bounteous → Stories featuring "boundless" Ascending the Lighthouse of Shadows Study tips featuring "boundless" Map Each Word Into a Connected Network Track How TOEFL Words Behave With Others Group TOEFL Words Around Academic Themes 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