Merriam-Webster's Collegiate® Dictionary, 11th Edition
STRAIGHTFORWARD
I. adjective
Date: 1790
1. free from evasiveness or obscurity ; exact , candid , clear-cut , precise , proceeding in a straight course or manner ; direct , undeviating , straightforwardly adverb straightforwardness noun
II. adverb also straightforwards
Date: 1809
in a straightforward manner