do する 　difficult to do しにくい think 考える　difficult to think 考えにくい 考えにくいけど、、、　--- , it's difficult to think though... あの人達の中に犯人がいるとは考えにくいけど… It's difficult to think that there is the criminal in the group. It's unlikely that there is the criminal in the group. so it's talking about existent possibility of the criminal and it is low.

ありがとうございます[emoji]