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Below are the 2 forms of similarity expressed for (V) ~nai and (N). Do I summarize these forms correctly?

Self-deduction:

(negative verb)  ふらなさそうだ
(noun)           かのじょ王女みたい

hearsay:

(negative verb)  ふらないそうだ
(noun)           かのじょ王女だそうだ
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Hearsay seems correct, but for self deduction with ~ない and い adjectives you have to remove the trailing い and add さそうだ

ふらなさそうだ

Here is a chart showing the comparison between the two (taken from Dictionary of Basic Japanese Grammar)

Comparison of -souda forms

While it doesn't directly include it in the chart, the negative forms are implicitly included under the い-adjectives. That goes for both ~ない and ~じゃない. The exception to this is いい, which has to be conjugated from the よい form instead - よさそう.

As can be seen from the chart, you were correct to assume you can't use ~そうだ after nouns. However, i believe 王女みたい conveys the feeling that even though they look like a 王女 you already know they not. You might use ~だろう or ~でしょう to say something is probably something else.

かのじょ王女でしょう (She is probably a princess)

Or could use the ~よう form.

かのじょ王女のようだ (She appears to be a princess)

References:

  1. Dictionary of Basic Japanese Grammar
  2. Guide to Japanese - Similarity of Hearsay

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