If someone is described as compliant, they are likely to be __________.

When someone is described as compliant, it means they are inclined to obey or yield to others' wishes or rules. This characteristic aligns closely with the notion of being submissive, which involves a willingness to conform or go along with the expectations or demands of others without resistance. Compliance suggests a certain level of acceptance and acquiescence, which is effectively captured by the term "submissive."

The other options reflect attitudes that are contrary to compliance: rebellious describes a tendency to resist authority, assertive involves confidently expressing one's own opinions or desires often in a way that seeks to influence others, and defiant indicates a bold disobedience and challenge to authority. These terms highlight traits that oppose the essence of being compliant, making "submissive" the most fitting choice.