Frayed nerves have replaced good vibes.

Frayed nerves grew yet more ragged as the hour wore on.

Frayed nerves and boredom and bad temper made the air hum like thunderstorm weather.

Frayed nerves kept many of the marines from getting much sleep.

Frayed nerves cause Helga and Mac to squabble with their charges, allowing the SAS operatives next door the opportunity to burst through the wall and kill both Helga and Mac.

Frayed nerves relaxed and the burns on his fingers cooled.