Pollyannaismn.
/ˌpɒlɪˈanə(r)ɪz(ə)m/, U.S. /ˌpɑliˈænəˌɪz(ə)m/ Behaviour characteristic of a Pollyanna; an instance of this.
ΘΚΠ
the mind > emotion > pleasure > cheerfulness > [noun] > cheerful optimism > naive or in disastrous circumstances > instance or statement of
Pollyannaism1924
1924 Edwardsville (Illinois) Intelligencer 21 Oct. 3/2 Why has Pollyannaism..become with many people of [sic] term of derision and even of contumely?
1946 G. Stimpson Bk. about Thousand Things 33 We hear now not only of pollyannas and pollyannaisms, but of pollyanna statements, pollyanna propaganda.
1975 Times 18 June 7/5 The special brand of United Nations Pollyannaism.
1996 Independent on Sunday 17 Mar. (Review Suppl.) 10/2 The ability to see silver linings in clouds is not simply Pollyannaism.
This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022).
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n.1924