1 to a greater extent than is desirable, permissible, or possible for a specified or understood purpose (too colourful for my taste; too large to fit).
2 colloq. extremely (you're too kind).
3 in addition (are they coming too?).
4 moreover (we must consider, too, the time of year).
Phrases and idioms:
none too
1 rather less than (feeling none too good).
2 barely. too bad see BAD. too much, too much for see MUCH. too right see RIGHT. too-too adj. & adv. colloq. extreme, excessive(ly).
Etymology: stressed form of TO, f. 16th-c. spelling too
Useful english dictionary. 2012.