the.com/fretful
the low hum of a mind chewing on a problem it can't swallow.
old rootsFrom Old English fretan, to devour or eat away.
baby badgeClassic word for fussy, restless infants.
frets connectionSame gnawing root as guitar frets, literally eaten notches.
worry's cousinImplies irritation, not just fear, simmering underneath.