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Four is often associated with the phrase "four afraid of nothing," which is a play on words in English. The phrase is a pun that uses the number four and the word "for" to create a humorous expression. In English, "for" is a preposition that can mean "in support of" or "in favor of," among other things. When you say "four afraid of nothing," it sounds like "for afraid of nothing," which is a twist on the popular phrase "fear nothing."

So, the answer is: four is not afraid of anything, because the phrase "four afraid of nothing" is a pun on "for afraid of nothing."

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Four's fears are heights, confinement (claustrophobia), killing innocent people (symbolized in his fear landscape as having to shoot a woman) and being beaten up by Marcus (his father). However, as said in Insurgent, his fears switched over the course of the trilogy.read more >>