From Longman Dictionary of Contemporary Englishtoo clever/rich/good etc by halftoo clever/rich/good etc by halfBritish English informalANNOY very clever, rich etc in an annoying way That boy’s too arrogant by half. → half
Examples from the Corpus
too clever/rich/good etc by half• The arithmetic can not be faulted - and may well be judged too clever by half. 