Not every competitive coworker is simply ambitious — some feel genuinely threatened by your skills and success. Here are the signs to watch for.

They Become Hypercompetitive

When a coworker suddenly starts treating every project as a competition — tracking your metrics, comparing outputs, or one-upping your contributions in meetings — it’s often rooted in insecurity. Healthy ambition looks different from someone who feels their position is threatened. The hypercompetitive version is reactive: it intensifies when you succeed and recedes when you stumble.

They Criticize Your Work More Harshly Than Others’

Feedback that’s disproportionate, frequent, or delivered publicly — especially from a peer — is a warning sign. When a coworker zeroes in on your errors while ignoring their own or others’, it suggests they’re looking for ways to diminish your standing. Criticism can be a tool of professional undermining when it’s selectively applied.

They Stop Including You

Exclusion is one of the most common responses to feeling threatened. You stop getting cc’d on emails, left out of informal conversations, or excluded from planning sessions that involve your work. This is often subtle — rarely a formal decision, but a pattern of small omissions that collectively reduce your visibility and influence.

They Undermine Your Relationships

A threatened coworker may try to damage your standing with key people. This can look like dropping negative comments about your work in conversations with leadership, steering credit away from you, or positioning themselves as the reliable alternative when your name comes up. It’s insidious because it happens out of earshot and is hard to address directly.

They Become Excessively Friendly or Helpful

Not all signs are hostile. Some people respond to feeling threatened by becoming overly accommodating — offering help you didn’t ask for, inserting themselves into your projects, or positioning themselves as collaborative partners. This can be a strategy to stay close and maintain visibility over your work, or to get credit by association.

They Express Doubt About Your Abilities

Subtle comments that cast doubt on your competence — especially in front of others — are a classic tool of professional insecurity. “Are you sure you have the bandwidth for that?” or “That’s a big leap from what you’ve done before” can be disguised as concern while functioning as undermining. Notice if these comments cluster around your achievements or opportunities.