Antonyms of adj red-letter

1 sense of red-letter

Sense 1
red-letter -- (memorable for being a special occasion; "on red-letter nights a large gathering greeted the celebrity")

INDIRECT (VIA unforgettable) -> forgettable -- (easily forgotten)

Similarity of adj red-letter

1 sense of red-letter

Sense 1
red-letter -- (memorable for being a special occasion; "on red-letter nights a large gathering greeted the celebrity")
       => unforgettable (vs. forgettable) -- (impossible to forget)

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