The audience tittered nervously at the awkward joke.

Meaning: This means the audience was feeling nervous or anxious and laughed in a nervous or restrained way.

Choice of Words: Tittered means to laugh in a nervous or restrained way. Nervously means in a nervous or anxious manner. When you put them together, "tittered nervously" means the audience laughed in a nervous or restrained way because they were feeling nervous or anxious.

Alternative Expressions

Related Expressions