Superlative form of alert; most watchful, attentive, and ready to respond quickly.
From 'alert' (from Old French 'alerter,' possibly from Italian 'all'erta') plus '-est' (superlative suffix). This follows regular English patterns for comparing adjectives.
In competitive video games, players talk about being 'alertest'—reflexes and awareness are so prized that the superlative captures a state athletes strive for!
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