IPA: /ˈluːdɪkrəsli/
KK: /ˈluːdɪkrəsli/
In a way that is absurd or ridiculous, often causing laughter or disbelief.
The idea that we could finish the project in one day was ludicrously optimistic.
Ludicrously → It is formed from "ludicrus" (from Latin, meaning playful or jesting) and the suffix "-ly" (meaning in a manner of). The word "ludicrously" means in a manner that is absurd or laughable, often due to being overly playful or ridiculous.
Think of something being 'playful' or 'jesting' ('ludicrus') to remember that 'ludicrously' describes something done in an absurd or laughable way.