IPA: /nɒnˈsʌk.sɛs/
KK: /nɑnˈsʌk.sɛs/
The state of not achieving a desired outcome or goal; a failure to succeed.
The project was considered a nonsuccess due to the lack of results.
Nonsuccess is formed from "non-" (meaning not) and "success" (from Latin "successus", meaning outcome or result). The word "nonsuccess" refers to the absence of a successful outcome or result.
Think of 'not' ('non-') having a 'successful outcome' ('success') — that's why nonsuccess means not achieving success.