IELTS invisible Definition Unable to be seen; imperceptible to the eye. Example "The insect was nearly invisible against the leaf's surface." Sign in to save IELTS Quiz → ← inviolable inviting → Study tips featuring "invisible" Audit Your Own Writing for Lexical Resource Explain New Words Out Loud To Yourself Audit Your Own Writing to Find Gaps Related words TOEFL brighten IELTS startle GRE abide SAT abnormal TOEFL aboard TOEFL abolition IELTS upward TOEFL abort IELTS abortion SAT abrupt SAT absence TOEFL absent