Best translation for “confused”: 迷惑，困惑，弄混，搞亂，搞混？
迷惑 and 困惑 can both be verb or adjective

迷 (deceive)
惑 (confuse)
迷惑 = to confuse (deceive someone and make him confused)

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困 (trap)
惑(confuse)
困惑 = to confuse (trap someone in a confusion)

We use 迷惑 for &quot;to confuse&quot; to emphasize the deception part
Example: 用妖言迷惑群眾 (妖言惑眾) - use lies and rumors to deceive and confuse the public
We use 困惑 for &quot;to confuse&quot;  to emphasize the trapping part
Example: 各人不同的口供困惑了調查人員 - Everyone’s different stories confused investigators (trapped them into a confusion with different stories- but there may or may not be deceptions)

弄混，搞亂，搞混 are just different versions of shortened form of &quot;弄/搞 (make-v) 混亂  (confusing-adj)&quot;
e.g. 搞亂局面 = 使局面混亂 (make situation confusing)

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1) English: &quot;What you just said confused me.&quot;

她剛才說的話(搞得)我(混亂了)
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2) English: &quot;I was confused by what she did.&quot;

我被她剛才說的話(搞得混亂了)
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4) For the preceding answers, are there any differences between Mandarin and Cantonese?

The grammar are the same, the terms may be different.
&quot;你剛才說的話搞得我混亂了&quot; (M)
&quot;你頭先講嘅嘢搞到我好混亂&quot; (C)
&quot;我被你剛才說的話搞得混亂了&quot; (M)
&quot;我被你頭先講嘅嘢搞到好混亂&quot; (C)