This is the 827th most frequent Swedish word.
sannolikt
Likely.
In this sentence, 'sannolikt' is used as an adverb to express the likelihood of an event happening.
Det är sannolikt att det kommer att regna i morgon.
It is likely that it will rain tomorrow.
In this case, 'sannolika' is an adjective modifying the noun 'orsaken', showing probability or likelihood.
Den sannolika orsaken till felet var en föråldrad programvara.
The probable cause of the error was outdated software.
Here, 'sannolikt' is again an adverb, indicating the probable lateness of someone's arrival.