Antonyms of adj bright_as_a_new_penny

1 sense of bright as a new penny

Sense 1
bright as a new penny (predicate) -- ((metaphor) shining brightly)

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 bright_as_a_new_penny

1 sense of bright as a new penny

Sense 1
bright as a new penny (predicate) -- ((metaphor) shining brightly)
       => bright (vs. dull) -- (emitting or reflecting light readily or in large amounts; "the sun was bright and hot"; "a bright sunlit room")