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    crucial

    US /ˈkruʃəl/

    UK /'kru:ʃl/

    • Adjective
    • Extremely important or necessary
    • Of great importance to the success of something.
    incredibly

    US /ɪnˈkrɛdəblɪ/

    UK /ɪnˈkredəbli/

    • Adverb
    • To a great degree; very; amazingly
    • Extremely; so much so it is hard to believe
    subtle

    US /ˈsʌtl/

    UK /'sʌtl/

    • Adjective
    • Delicate or slight so it is difficult to perceive
    • Clever or indirect but hides the true purpose
    extremely

    US /ɪk'strimlɪ/

    UK /ɪkˈstri:mli/

    • Adverb
    • In a way that is much more than usual or expected
    • Remarkably; unusually.
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