Proceeding in a straight course or manner; not deviating; honest; frank.

In a straightforward manner.

without concealment or deception; honest; "their business was open and aboveboard"; "straightforward in all his business affairs"

describes information, subjects and materials that learners often meet in their work, studies or other activities.

free from ambiguity; "a straightforward set of instructions"

without evasion or compromise; "a square contradiction"; "he is not being as straightforward as it appears"

pointed directly ahead; "a straightforward gaze"

By a straightforward computation: I lost my notes.