まっすぐ
まっすぐ · massugu · JLPT N5 · na-adj
direct
📏 真っ直ぐ = ma (truly) + sugu (straight): truly straight
Written 真っ直ぐ: the prefix 真 (ma, true/pure) doubles the next consonant for emphasis, as in 真っ白 (masshiro, pure white). 直ぐ (sugu) means straight or direct, and also right away. So massugu is literally dead straight.