Quid Non means 'Why Not' in Latin.
"Quid Non" means "it [is] not". More precisely, it is shorthand for frankly stating that the preceding opinion or statement is incorrect.
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Why not relax
Quid ita serius = Why so serious?
How are you today?
Literally "What does this want for itself?", Quid hoc sibi vult is a Latin idiom that means "What does this mean?"Quoted with quod rather than quid, it means "[Which is] what this means".
it means stupidity
If you mean Quidditch, he is Seeker.
it means stupidity
The Quid was created in 1964.
I believe you mean qid, which is a Latin abbreviation meaning "four times a day".
Quid is a slang term for Pound. One Quid, Two Quid, One Hundred Quid. 12.50 Quid is Twelve Pound and 50 Pence. See link to Universal Currency Converter for a current currency conversion.
The Latin phrase 'vidi quidi' contains an error, and is incomplete. For the word 'quidi' needs to be written as 'quid'. The word-by-word translation is as follows: 'vidi' means '[I] have seen'; and 'quid' means 'what'. The English meaning of the corrected phrase, 'vidi quid', is the following: I have seen what... .
The Latin 'Be healthy' is Vale / Valete (singular / plural). It is also the normal Latin expression to mean Goodbye.