A question about the study question 「あなたの父はとても優し____。」

A question about the study question あなたの父はとても優し____。
I have got the correct answer and it was そうだ (i.e. the full sentence is あなたの父はとても優しそうだ)
May I ask why the the い is skipped here? Shouldn’t it be 優しいそうだ instead of 優しそうだ in the question?

Look at the structure section of this grammar point

Do not confuse this with this grammar point which has a different meaning:

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