Antonyms of adj agleam

1 sense of agleam

Sense 1
agleam, gleaming, nitid -- (bright with a steady but subdued shining; "from the plane we saw the city below agleam with lights"; "the gleaming brass on the altar"; "Nereids beneath the nitid moon")

INDIRECT (VIA bright) -> dull -- (emitting or reflecting very little light; "a dull glow"; "dull silver badly in need of a polish"; "a dull sky")

Similarity of adj agleam

1 sense of agleam

Sense 1
agleam, gleaming, nitid -- (bright with a steady but subdued shining; "from the plane we saw the city below agleam with lights"; "the gleaming brass on the altar"; "Nereids beneath the nitid moon")
       => bright (vs. dull) -- (emitting or reflecting light readily or in large amounts; "the sun was bright and hot"; "a bright sunlit room")