形容詞 motionless:

1. not in physical motion
   同義詞：inactive, static, still

1. He stands motionless and silent, looking neither to the right nor to the left.
   他一動也不動地站著，默不作聲，既不右盼，也不左顧。
2. He moved no more, unless to feed the furnace, but remained motionless as a statue.
   除了給爐子加煤，他一動也不動，好像雕像似的靜止在那里。
3. She stood there (being) motionless.
   她站在那兒，一動也不動。
4. The cat remained motionless, waiting for the mouse to come out of its hole.
   貓一動不動地等著老鼠出洞。

mo.tion.less

adj.（形容詞）
Having or making no motion.
不動的：不移動的或靜止的

【引伸】
mo.tionlessly
adv.（副詞）
mo.tionlessness
n.（名詞）