The adjective you're looking for is "passive." A passive person tends to be hesitant in taking the lead or initiative. To find adjectives that describe certain traits, you can use a variety of resources. One option is to consult a thesaurus, a type of reference book or online tool that provides synonyms, antonyms, and related words for a given term. By looking up the antonym of "leader" or "initiative," in this case, you can find the adjective "passive" as a suitable description. Another method is to use an online search engine and type in a phrase like "adjective for someone who does not like to take the lead." Various sources, such as dictionaries or forums, may provide suggestions and explanations for the term you are seeking.