This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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ad. in a dispassionate manner

Without passion; calmly; coolly.

ad. in an impartially dispassionate manner

"The reader who reads science fiction dispassionately is likely to be struck by how closely the human imagination is tied to reality, even when it deliberately sets out to violate it."

compassionately    passionately