Antonyms of adj unopened

1 sense of unopened

Sense 1
unopened -- (not yet opened or unsealed; "unopened Christmas presents")

INDIRECT (VIA sealed) -> unsealed -- (not closed or secured with or as if with a seal; "unsealed goods"; "the letter arrived unsealed")

Similarity of adj unopened

1 sense of unopened

Sense 1
unopened -- (not yet opened or unsealed; "unopened Christmas presents")
       => sealed (vs. unsealed) -- (closed or secured with or as if with a seal; "my lips are sealed"; "the package is still sealed"; "the premises are sealed")