Straight; direct; upright — not bending; moving directly forward or having a straight posture.
駅を出てまっすぐ行くと交差点があります。
Go straight out of the station and you'll find the intersection.
先生の前では背筋をまっすぐにしなさい。
Keep your back straight in front of the teacher.
道を曲がらずにまっすぐ進んでください。
Please proceed straight without turning.
彼女はまっすぐ家に帰った。
She went straight home.
Straightforward; honest; frank — describing a person who is sincere and direct.
彼はまっすぐな性格で、人の悪口は言わない。
He is straightforward and doesn't speak ill of others.
まっすぐな答えが欲しい。
I want a straight/direct answer.
彼女のまっすぐな言葉に心を打たれた。
I was moved by her frank words.