单词：omnidirectional 

形容词

• 
  [1.a.omnidirectional] (同义词:[omnidirectional( adj. 全方向的 )]  )
• 
  注释列句：not directional; "omnidirectional antenna"
• 反义词 -> [directional( adj. 方向的 )] 
  属于名词 -> [direction( n. 方向, 指导, 趋势, (常用复数)指示, 用法, 说明(书), 收件人地址 )]