The incorrectly spelled word is "Perterb."

The correct spelling is "Perturb," which means to disturb, unsettle, or cause anxiety or concern.

The other options, "Perceive," "Pigeon," and "Passive," are spelled correctly and have the following meanings:

• Perceive: Means to become aware of or to understand something through the senses or intuition.
• Pigeon: Refers to a type of bird belonging to the family Columbidae.
• Passive: Describes a state or attitude of not taking an active role or not participating actively.