Open

//ˈəʊ.pən//

Antonyms for "open" (19 found)

Adjective(13 words)

abstruse arcane checked closed closed-source hidden obscure patented proprietary shut sub rosa tight without prejudice

Adverb(1 words)

Verb(4 words)

bare close obstruct shut up

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.