Sufficient
Sufficient adjective - Of a quantity that can fulfill a need or requirement but without being abundant.
Unable is an antonym for sufficient.
Unable
Unable adjective - Lacking qualities (as knowledge, skill, or ability) required to do a job.
Both words in one sentence
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This plays off of the fear of child abuse and children being unable to rely on their parents for sufficient protection.
Source: Series / Firefly - It emits an inaudible sound that makes Priors unable to use their psychic powers; however, both Damaris and Daniel Jackson/Merlin were able to overcome it given sufficient time.
Source: Power Nullifier -
While surprisingly powerful, lacking sufficient training in the use of its mental interface will also make it shield you from any food or liquid you intent to ingest and render you unable to remove it.
Cite this Source
Unable and Sufficient. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/sufficient/unable
Sufficient & Unable. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/sufficient/unable>.
Unable or Sufficient. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/sufficient/unable.
Google Ngram Viewer shows how "sufficient" and "unable" have occurred on timeline