The phrase "feel blindly" refers to performing an action or making a decision without taking into consideration all available information. Synonyms for this term include going in blindly, acting recklessly, taking a leap of faith, jumping in head-first, rolling the dice, operating on a hunch, and taking a shot in the dark. These expressions all suggest a level of uncertainty or risk involved in the action being taken. While it may sometimes be necessary to take a chance without all the facts, it is generally advisable to gather as much information as possible before making important decisions.