* A misspelling: It might be a misspelling of a similar word in another language. Please double-check the spelling and provide any context you have.
* A regional term: It could be a word from a specific dialect or region. If you can provide more information about its origin, it might be possible to identify its meaning.
* A made-up word: It might be a made-up word with a specific meaning within a particular context or fictional work.
To help me understand what you mean, please provide:
* The language: What language is this word from?
* The context: Where did you hear or see this word? What was the situation?
With more information, I can try to help you understand the meaning of "sinisikil."