Definitions of idle:

• verb:   be idle; exist in a changeless situation
• verb:   run disconnected or idle
• adjective:   lacking a sense of restraint or responsibility

  Example: "Idle talk"

• adjective:   silly or trivial

  Example: "Idle pleasure"

• adjective:   not in active use

  Example: "The machinery sat idle during the strike"

• adjective:   not in action or at work

  Example: "An idle laborer"

• adjective:   not having a job

  Example: "Idle carpenters"

• adjective:   not yielding a return

  Example: "Idle funds"

• adjective:   without a basis in reason or fact

  Example: "Idle fears"