* Extreme focus on the loved one: You are consumed by thoughts of them and your relationship, often neglecting other aspects of your life.
* Emotional vulnerability: Your feelings are intense and you may be easily swayed by the other person's actions or words.
* Lack of objectivity: You may be blind to the flaws or red flags in the relationship due to the overwhelming feelings of love.
Example: "After meeting Emily, John was completely lost in love. He spent all his time thinking about her and neglected his work."
It's often used to describe a state of heightened emotion and passionate love, but can also be used to describe a negative situation where someone has become overly dependent on their partner or has made poor decisions due to their infatuation.