Answer:
lifelessly, casually, halfheartedly, sluggishly, idly, lazily, spiritlessly, Desultorily, indolently, wearily, sleepily, listlessly, lackadaisically, tiredly, languidly.
Explanation:
these are some antonyms for laboriously which means :in a way that takes considerable time and effort.
One time I investigated that one of my favorite shirt was gone. So, it was a mystery for me i tried to describe it in my head. I remember it in my head and look everywhere at my house and grandma house but it was no where to be found. So, I look downstairs of my grandma house and i sawed in my cousin closet that she had my favorite shirt. So,my mystery was my cousin.
What book is this from? Can't help without knowing.