Alert
Alert adjective - Having or showing the ability to respond without delay or hesitation.
Usage example: an alert force of commandos, ready to go on a mission at a moment's notice
Idle
Idle adjective - Not being in a state of use, activity, or employment.
Both words in one sentence
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Their reaction times are three tenths of a second to fire when they're idle, and one tenth of a second to fire if they're alert.
Source: Video Game / Black Mesa
Cite this Source
Idle and Alert. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/alert/idle
Alert & Idle. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/alert/idle>.
Idle or Alert. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/alert/idle.
Google Ngram Viewer shows how "alert" and "idle" have occurred on timeline