There’s already a word for that!

Prideful

If you are full of pride, you are proud. This prideful thing is unnecessary and longer to say.

Nauseating

I can understand this one. Nauseous means nauseating (to induce nausea). However, it often gets used to mean nauseated. So when you hear someone say nauseous, you’re unsure whether they really know what they’re talking about. I suggest sticking to nauseous as much as possible.

Reoccur

Yep, the rule is to add re- to a word to mean do it again. However, occur already has a word for “occur again.” Recur. Save a syllable.

Orientated

Whoa, what happened to orient? It’s a great word. Orient is a verb, oriented is the adjective, and that’s all you need here.

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Are there any others you can think of? I’ll add them to the list.