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over-ambitious
over-ambitious adj.
Brit. 
/ˌəʊvə(r)amˈbɪʃəs/
, /ˌəʊvə(r)amˈbɪʃəs/U.S. /ˌoʊvərˌæmˈbɪʃəs/
/ˌoʊvərˌæmˈbɪʃəs/ΚΠ
?1655 R. Baron Mirza Argt. sig. A7 Yet (like most mean men hoisted to extraordinary preferment,) he grew so over ambitious, as to aim at the Crown.
1839 N. P. Willis Bianca Visconti iii. i. 59 This o'er-ambitious Sforza Must not be Duke.
1994 Sunday Times 6 Mar. v. 11/2 The fear of either laying down rigid tramlines or failing to achieve over-ambitious targets.
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