eager to serve or help
I have been extremely fortunate in having parents who have always been solicitous for my welfare.
sollicitus (agitated) (Latin)
Solo + sit!!
Question: when do you sit alone???
Answer: when you are with full of "anxiety and concern" about your child who is in "us" and thus "Solicitous" soli (solo). if you are doing work on your own (solo) then you will do it eagerly and with much care. Solicit means to request earnestly for something, but if you have to wait for it to happen then you are liable to become solicitous.