The antonym for "were plentiful" would be "were scarce" or "were limited." In contrast to an abundant supply or abundance, "scarcity" implies that there is not enough to meet the demand or the needs of the situation. Often, a shortage or scarcity can lead to increased competition, higher prices, or difficult decision-making. For instance, limited resources may lead to rationing, difficult choices, or lowered expectations. However, scarcity can also be an opportunity to rethink priorities, optimize resources, or develop new solutions. Ultimately, whether there is plenty or scarcity, the challenge is to make the best of what we have and to adapt to changing circumstances.