adjective, ants·i·er, ants·i·est. Informal.

  1. unable to sit or stand still; fidgety: The children were bored and antsy.
  2. apprehensive, uneasy, or nervous: I’m a little antsy since hearing those storm warnings.

adjective antsier or antsiest

  1. informal restless, nervous, and impatient

1838, American English, from plural of ant + -y (2); probably reflecting the same image as the slang expression have ants in (one’s) pants “be restless and fidgety” from a century later. Related: Antsiness.

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