This is the 12194th most frequent Turkish word.
güvenmediği
"That he/she/it does not trust."
Here, 'güvenmediği' is used as an adjective clause describing 'insanlarla' (people). The clause indicates lack of trust.
O, güvenmediği insanlarla sırlarını paylaşmaz.
He does not share his secrets with people he does not trust.
In this sentence, 'güvenmediği' refers to 'mekanlarda' (places) and implies the subject's distrust of them.
Güvenmediği mekanlarda yemek yemiyor.
She doesn't eat in places she doesn't trust.
Here, 'güvenmediği' modifies 'bir yazılımı' (a software) and indicates skepticism or cautiousness.