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over-optimism
over-optimism n.
Brit. 
/ˌəʊvə(r)ˈɒptᵻmɪz(ə)m/
, /ˌəʊvə(r)ˈɒptᵻmɪz(ə)m/U.S. /ˌoʊvərˈɑptəˌmɪzəm/
/ˌoʊvərˈɑptəˌmɪzəm/ΚΠ
1898 Atlantic Monthly June 762/1 It may seem an over-optimism to declare that this is but an accident and circumstance of the time.
1990 Harvard Business Rev. Mar. 157/1 Managers are susceptible to human shortcomings like overoptimism and narrow thinking.
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