1."(be) jarred awake" = be awakened by a harsh noise or impact (to jar = to shock or irritate by something harsh and unpleasant). This is an example of [action verb + adjective indicating result]. E.g: The earthquake shook him awake = He was shaken awake by the earthquake. 2."justifiably worried" = worried as expected. (justifiable = not wrong or out of normal expectations). It means the fact she was worried is understandable, since there were reasonable reasons for it. 3."rather forbidding". "rather" means more than usual or acceptable. "a rather forbidding person" is someone who like to set and enforce restrictive rules to keep other from freely doing what they want, saying "You can't do this, you can't do that ...".