unruly

1. ADJ If you describe people, especially children, as unruly, you mean that they behave badly and are difficult to control. (尤指儿童)难管教的

...unruly behaviour. …不守规矩的行为。

2. ADJ Unruly hair is difficult to keep tidy. (头发)难梳理的

The man had remarkably black, unruly hair. 那个男子有一头不同寻常的乱蓬蓬的黑发。