Still liable for defamation?

I have Face Reading skill. So that I can do tell most of the things about a person just by looking at their face. So I would like to use my skill to make this as my career and I really don't want to waste my skill..I can be helpful to many and many. But soo afraid to about legal problems. Mainly Defamation. One person in the same field told me to talk diplomatically. So I choose to tell things only using "Maybe", "Probably" , "Possibly" like these words. For example If a person seems lazy to me.. I will say "Possibly he is a lazy person". or if a person is seems selfish to me, I will say "Maybe he is selfish guy". Does this still count as Defamation?