Correct spelling for the English word "one sidednessing" is [wˈɒn sˈa͡ɪddnəsɪŋ], [wˈɒn sˈaɪddnəsɪŋ], [w_ˈɒ_n s_ˈaɪ_d_d_n_ə_s_ɪ_ŋ] (IPA phonetic alphabet).
The word "one-sidednessing" does not have an established etymology, as it is not a widely recognized or commonly used term. It appears to be a derived noun from the adjective "one-sided", which implies a lack of balance, fairness, or objectivity in a situation or perspective. However, "one-sidednessing" is not a standard English word, and its usage is unclear without proper context.