Whatchamacallit

I guess what I'm asking is what word fits the individual's belief of self related to the nihilist state of mind. Self effacing seems too simple.

Quagmire can be used as a noun with two different meanings. 1. A soft, soggy, swampy, area. (See marsh.) 2. A difficult and troubling situation. (See predicament.) The word has its origins with "quag" and "mire" to mean bog. The word is also figuratively used to mean "a difficult situation" [^(1)^](https://www.dictionary.com/browse/quagmire)[^(2)^](https://www.etymonline.com/word/quagmire)[^(3)^](https://www.merriam-webster.com/dictionary/quagmire)