perspicacious
adjective /ˌpɜːspɪˈkeɪʃəs/ /ˌpɜːrspɪˈkeɪʃəs/(formal)
able to understand somebody/something quickly and accurately; showing this
a perspicacious remark
He was perspicacious enough to realize that things were soon going to change.
https://www.oxfordlearnersdictionaries.com/definition/english/perspicacious
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