darkened (Adjective) — (of fabrics and paper) grown dark in colour over time. ex. "the darkened margins of the paper"
darkened (Adjective) — Become or made dark by lack of light. ex. "a darkened house" ex. "the darkened theatre"
darkened (Verb) — Become dark or darker. ex. "The sky darkened"
darkened (Verb) — Tarnish or stain. ex. "a scandal that darkened the family's good name"
darkened (Verb) — Make dark or darker. ex. "darken a room"