This is the 11501st most frequent Swedish word.
oavsiktlig
Unintentional.
Here, 'oavsiktligt' is used as an adjective in the adverbial form to describe the nature of the mistake as unintentional.
Hans misstag var helt oavsiktligt.
His mistake was completely unintentional.
In this sentence, 'oavsiktligt' serves as an adverb modifying the verb 'gjorde' (made), clarifying that the choice was not deliberate.
Jag gjorde det där val oavsiktligt.
I made that choice unintentionally.
Here, 'oavsiktligt' is used as an adjective to describe 'resultat' (result) as unintended, giving context to the consequence.