Underambitious

A woman—or at least I thought so; she could have been a slightly underambitious transvestite—in a leather miniskirt and bustier top, and the sort of waist-length blond extensions designed for twirling around at the same time as the wearer's nipple tassels.

You risk your work being dismissed as underambitious and so failing to find out anything important.

He is underambitious in his characterization of morality, cashing out prescriptivity in terms of prevailing expectations rather than objective authority, settling for an account of a sense of obligations rather than obligations themselves, and for empathetic behavior rather than empathetic motivations.