Asked by Mother is to brother as fly is to?

Mother is to brother as fly is to?

4 letters. Must contain scr, spr, str, or thr.
Answered by Ms. Sue
spry
Answered by bobpursley
I wonder why this is in 5th grade homework..it is well beyond a <i>normal</i> 5th grader.

What is spry?
Answered by DrBob222
unspry as in can't get around very well