Undermine
Definition 1 of 2
Pro Tip 1/3
Subtle Weakening
Undermine suggests a gradual process, not an immediate effect. His jokes about her work began to slowly undermine her motivation.
Pro Tip 2/3
Hidden Motives
Actions that undermine often appear harmless at first. Smiling, he shared the team's plans with the rival, aiming to undermine their success.
Pro Tip 3/3
Connotation of Betrayal
Undermine can imply betrayal, as trust is broken. By spreading rumors, she began to undermine his reputation among his friends.