ner·vous 
/ˈnɚvəs/ adjective
/ˈnɚvəs/ adjective 1 [more nervous; most nervous] a : having or showing feelings of being worried and afraid about what might happen
▪ She is/feels nervous about her job interview. ▪ All this waiting is making me nervous. ▪ He gave a nervous glance at the clock. ▪ a nervous smile ▪ Before the wedding the bride's father was a nervous wreck. [=he was extremely nervous]
b : often or easily becoming worried and afraid about what might happen
▪ His nervous mother is always worrying that something terrible will happen to him. ▪ He has a nervous disposition.
c : causing someone to feel worried and afraid : making someone nervous
▪ It was a very nervous situation. 2 always used before a noun : of or relating to the nerves in your body
▪ nervous tissue ▪ She suffers from a nervous disorder/condition. : caused by or affected by nerves ▪ He walked around with a nervous twitch. ▪ He had a nervous habit of pulling at his hair. ▪ The boy has a lot of nervous energy.
▪ She is/feels nervous about her job interview. ▪ All this waiting is making me nervous. ▪ He gave a nervous glance at the clock. ▪ a nervous smile ▪ Before the wedding the bride's father was a nervous wreck. [=he was extremely nervous]
b : often or easily becoming worried and afraid about what might happen
▪ His nervous mother is always worrying that something terrible will happen to him. ▪ He has a nervous disposition.
c : causing someone to feel worried and afraid : making someone nervous
▪ It was a very nervous situation.
▪ nervous tissue ▪ She suffers from a nervous disorder/condition. : caused by or affected by nerves ▪ He walked around with a nervous twitch. ▪ He had a nervous habit of pulling at his hair. ▪ The boy has a lot of nervous energy.
— ner·vous·ly adverb
▪ Dad paced nervously around the waiting room.
▪ Dad paced nervously around the waiting room.
— ner·vous·ness noun [noncount]
▪ The student showed no sign of nervousness.
▪ The student showed no sign of nervousness.
