Which term means to be faithful to or endure?

The term that means to be faithful to or endure is "abide." This word conveys the idea of remaining steadfast or committed to something over time. When someone abides by a principle or a belief, they are true to it, demonstrating loyalty and perseverance. Additionally, "abide" can imply enduring hardships or challenges without giving up, suggesting resilience and commitment.

In contrast, the other terms do not carry this meaning. "Abhor" refers to a strong dislike or hatred for something, "acumen" denotes sharpness of insight or perception, particularly in practical matters, and "alacrity" indicates a cheerful readiness or eagerness to do something. Each of these terms has its unique definition, which makes "abide" the only choice that aligns with the concepts of faithfulness and endurance.