With insufficient light for easy discernment or comprehension / With a dark appearance / (figuratively) In a manner which is not readily visible or noticeable; inconspicuously

(chiefly poetic) Relating to darkness or obscurity.

(dated slang, offensive, ethnic slur) A person with dark skin. / (slang, obsolete) A dark lantern.

One who or that which darkens.

plural of darkener

Somewhat dark.

(transitive) To make dark or darker by reducing light. / (intransitive) To become dark or darker (having less light).

simple past tense and past participle of darken

Made dark or lightproof by the exclusion of light. / Having an absence of light, such as at night-time.

To be dark; to be visible only darkly. / To become dark; to show indistinctly.