A cool fret rolled in from the North Sea, muffling the cliffs and streets in damp grey.

He fretted over the lost passport until the airline found it at the gate.

She tuned her fretted guitar carefully before the performance.

The fretful toddler refused to nap and kept crying until we picked him up.

Her constant fretfulness wore on everyone in the tiny office.

She sat by the window, fretting over whether she had made the right decision.

Her constant fretting over the exam results kept her awake at night.

We measured FRET between the donor and acceptor fluorophores to determine protein conformational changes.

Her constant frettings about the exam made it hard for her to relax.

The therapist noted several fretfulnesses in the child's behavior over the past month.