underworked

verb (used with object), un·der·worked, un·der·work·ing.

1. to do less work on than is necessary or required: to underwork an idea.
2. to employ inadequately: He underworks his mind and overworks his feet.

verb (used without object), un·der·worked, un·der·work·ing.

3. to do less work than is normal or proper: He is fat because he underworks and overeats.