IPA: /ɪmˈplɔːzəblɪ/
KK: /ɪmˈplɔːzəblɪ/
In a way that is not believable or likely to be true.
She explained the situation implausibly, making it hard for anyone to believe her story.
Implausibly → It is formed from "in-" (meaning not) and "plausibilis" (from Latin, meaning worthy of applause or approval) and the suffix "-ly" (meaning in a manner). The word "implausibly" means in a manner that is not worthy of approval or belief.
Think of 'not' ('in-') being combined with something that is 'worthy of applause' ('plausibilis') — this helps you remember that 'implausibly' means something that is not believable.