Concerned
Observing
Observing adjective - Quick to notice; showing quick and keen perception.
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Synonyms for Observing
Concerned and observing are semantically related. Sometimes you can use "Concerned" instead an adjective "Observing".
Both words in one sentence
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And at the very end, Earth essentially becomes this, at least as far as observing Martian astronomers are concerned.
Source: Creator / H. G. Wells -
Compare Nun Too Holy, where a character is ostensibly part of a religious order, but doesn't seem too concerned with observing its tenets or restrictions.
Source: Bad Habits
Cite this Source
Observing and Concerned. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/concerned/observing
Concerned & Observing. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/concerned/observing>.
Observing or Concerned. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/concerned/observing.
Google Ngram Viewer shows how "concerned" and "observing" have occurred on timeline