| operational(happening, ongoing, started) | |
| operative(happening, ongoing, started) | |
| optional | |
| proceeding(happening, ongoing, started) | |
| progressing(constant, current, continuous, happening, ongoing) | |
| rapid-fire | |
| shadowy(adjective, unknown, unfixed, unlimited, unspecified) | |
| started(happening, ongoing) | |
| unanswered | |
| unasked | |
| uncertain(adjective, unknown, unfixed, unlimited, unspecified) | |
| unclear(adjective, vague, unknown, unfixed, undecided) | |
| unconditional | |
| uncontrolled | |
| undependable(adjective, unknown, unfixed, unlimited, unspecified) | |
| under way(expression, happening, ongoing, started) | |
| unfinished(constant, current, continuous, happening, ongoing) | |
| unfixed(adjective, unknown, undecided, unlimited, unspecified) | |
| unfolding(constant, current, continuous, happening, ongoing) | |
| unknown(adjective, unfixed, unlimited, unspecified) |
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| APA | Smart Define. (2015). open-ended thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/open-ended/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "open-ended thesaurus" https://smartdefine.org/open-ended/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, open-ended thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/open-ended/thesaurus/synonyms>. |
| MLA | Smart Define. "open-ended thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/open-ended/thesaurus/synonyms> |