OED: Adjective. Having no money, penniless; in want of money. (OED, 2nd Ed, accessed through U of MN Libraries)
Taubes: “So why were they fat? ‘It is difficult to explain the high frequency of obesity seen in a relatively impecunious society such as exists in the West Indies, when compared to the standard of living enjoyed in the more developed countries…’” (242).
Sentence: The impecunious college students searched for low-cost food.