Be Honest, but Kind
Speaking of candid, yes, it’s important to speak what is on your mind, but remember there is often a kind, yet direct way to do it. You can be honest without being rude, and you can share your opinion in a constructive way. If someone is being lazy on a group project, tell him or her that you need to better communicate and work as a team. If someone shows up late every day, offer some tips to be more efficient with their morning routine and their commute.