ignoble

Not noble; plebeian; common.

I was not ignoble of descent.

Not honorable; base.

A base, ignoble mind, / That mounts no higher than a bird can soar.

far from the madding crowd's ignoble strife

Not a true or "noble" falcon; said of certain hawks, such as the goshawk.

Of an element, dangerously reactive.

To make ignoble; to bring low.