Hello. You did not enter the text to which this question refers, which makes it impossible for it to be answered. However, I will try to help you in the best possible way.
To answer this question, you will need to read the text to which it is related. In this text, you will be able to perceive Marlow's first impressions about the African coast, when he, or the narrator, presents his thoughts and opinions about the African coast. These thoughts and opinions will be presented by a descriptive text, where you will see the use of adjectives, which are words that try to characterize and conceptualize something or someone. What he thinks about the French ship will also be presented through a descriptive text with the presence of adjectives, but directly related to the ship and not the African coast.