訓 はや(い) ・ 音 シツ
Sino-Vietnamese: tật
Sickness 疒 plus arrow 矢: a disease that strikes as fast as an arrow; hence swift, as in 疾走, dashing.
Stroke data: KanjiVG (CC BY-SA 3.0) — kanjivg.tagaini.net
馬が草原を疾走する。 (うまがそうげんをしっそうする)
A horse gallops across the grassland.