1)to be with sight
2)to operate without blindness
3)completely fake word.
This is an improper / fake word i heard a person use at the bar last night. He used it in a sentence like, you cant go blindlessly through life, (eg, bob charged blindlessly up the stairs).
however this word cannot be used interchangeably with 'blindly', as this horribly mangled and fake word contains within it a double negative.
thus, the other definitions on urban dictionary regarding this word are deficient and seem to disregard the basic structure of the word. this word cannot be used interchangeably with blindly, it means exactly the opposite. while being horribly fake and mutated.
****(I would thus request that the editors of UD make my entry the primary source for this definition, as it is the only definition which is derived from the structure of the word, and thus correct)
1) to be blind is to be with out sight
2)to be blind-less is to be with sight, or to be not without sight.
3)blindlessly: is then just a horrible mutant word birthed from a drunken encounter with the proper vernacular