In one word you can convey a lot of information about yourself, people around you in any situation. "I care about you. I really don't care about you. Treat him/her with care, him/her is emotional. Take care of your pet. I care about all the people lost in the store. Do you care if you live or died? Etc.
All this week I felt weak because when I crossed the weak bridge last week it feel and my weak knees gave out and I tumbled to the ground. Maybe next week I won't feel so weak... unless my recovery takes two weeks. If I'm still weak I won't be able to return to work for a couple more weeks.