adverb/le.z‿jø fɛʁ.me/
with one's eyes closed, hands down, one-handed, standing on one's head, with one hand tied behind one's back (very easily); without hesitation, in total confidence, sight unseen
“acheter quelque chose les yeux fermés” — to buy something without hesitation
Synonyms: les doigts dans le nez, à pieds joints, la tête la première