Too  adv. 1 to a greater extent than is desirable or permissible (too large). 2 colloq. Very (not too sure). 3 in addition (i'm coming too). 4 moreover (food was bad, and expensive too).  none too rather less than (feeling none too good). Too bad see *bad. Too much intolerable. Too much for 1 more than a match for. 2 beyond what is endurable by. Too right see *right. [stressed form of *to]