Word Use/Choice: Worst?

A strongly worded title, but basically I'm trying to create a conlang with a lexicon of as few words as possible, and while I've read up a bit on Toki Pona I want to know:

What are some basic words in your first language (or your conlang) that you think are unnecessary, and can be done without? I want to know what you guys think can be cut off a language to get an idea of the shape of mine.

(Ex: I think that the difference between frustration, irritation, and anger are small enough that a word can be used with context to be all three +)