adverb

without being able to see; unseeingly.

she began groping blindly in the dark

sightlessly,without sight,without vision,unseeingly,impetuously,impulsively,rashly,hastily,recklessly,heedlessly,uncontrolledly,uncontrollably,uninhibitedly,unrestrainedly,wildly,irrationally,frantically,violently,furiously,uncritically,unthinkingly,mindlessly,injudiciously,indiscriminately,airily,insouciantly,credulously,naively,undiscerningly