► 形容動詞水平  [すいへい]    
meaning:  horizontal  rank: 2☆ 
机が水平でない ⇨ The desk is not horizontal, level
☆ 水平に
走る電線 ⇨ An electrical wire running horizontally
More examples:- 船が段々水平線に向かって遠ざかっていく ⇨ The ship is slowly going away toward the horizon
 - 船が水平線の向こうに消えていった ⇨ The ship disappeared over the horizon