Egoistic has a negative tone, suggesting a lack of social cooperation and empathy. Avoid acting egoistic during team projects; it's important to value everyone's input.
Pro Tip 2/3
Not Narcissistic
Although similar, 'egoistic' isn't as extreme as 'narcissistic,' which implies a deep fixation on oneself. He may be egoistic at times, but he isn't narcissistic; he can show concern for others too.
Pro Tip 3/3
Cultural Perception
In some cultures, being egoistic is seen as particularly offensive, as community is valued over the individual. In her hometown, her egoistic approach to life was frowned upon because of the community-focused culture.