Here's a breakdown of why it's likely not a standard suffix:
* Common suffixes in English: "-ed" (past tense), "-ing" (present participle), "-er" (noun for a person or thing that does something), "-ment" (noun for a state or process), etc.
* Misspelling: It's possible that "-ned" is a misspelling of "-end," which is a common suffix meaning "to bring to a finish."
* Technical or Academic: Perhaps "-ned" is used in a specific field of study, such as medicine or engineering, but it's not commonly encountered in everyday language.
If you can provide more context, like the word it's attached to or the sentence it's part of, I might be able to help you understand its meaning.