Glossary entry (derived from question below)
Hungarian term or phrase:
feltűnő értékaránytalanság miatti megtámadási jog
English translation:
the right to contest for obvious disproportionality
Hungarian term
Hungary
feltűnő értékaránytalanság miatti megtámadási jog
PRO (1): Ildiko Santana
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Proposed translations
United States
Accurate / Fast / Cheap -- Pick Two
Native in: Hungarian 
, English
Works in: Hungarian to English, English to Hungarian, English, and 1 more.
the right to contest for obvious disproportionality
feltűnő értékaránytalanság: obvious disproportionality
Az adott bekezdések angolul:
Section 6:98 [Obvious disproportionality]
(1) If, upon the conclusion of the contract, there is an obvious disproportionality between the value of the service and the consideration, and there is no intention by one of the parties to grant benefits free of charge, the aggrieved party may contest the contract. A person who was able to recognise the *obvious disproportionality* or undertook the risk of obvious disproportionality, shall not contest the contract.
(2) Except for contracts between consumers and undertakings, the parties may exclude in the contract the *right to contest* as determined in paragraph (1).
Magyarul:
6:98. § [Feltűnő értékaránytalanság]
(1) Ha a szolgáltatás és az ellenszolgáltatás értéke között anélkül, hogy az egyik felet az ingyenes juttatás szándéka vezetné, a szerződés megkötésének időpontjában feltűnően nagy az aránytalanság, a sérelmet szenvedett fél a szerződést megtámadhatja. Nem támadhatja meg a szerződést az, aki a feltűnő értékaránytalanságot felismerhette vagy annak kockázatát vállalta.
(2) A felek az (1) bekezdésben megállapított megtámadási jogot – fogyasztó és vállalkozás közötti szerződés kivételével – a szerződésben kizárhatják.
Hungary
Marianna Brazda, MCIL CL, MA, DPSI Law
English - Hungarian translator
Native in: Hungarian (Variant: Hungary)
Works in: English to Hungarian, Hungarian to English
the right to challenge conspicuous disproportion to any value
Conspicuous saving vagy conspicuous consumption kifejezésekre számos találat van a neten, tehát a feltűnőre az szerintem mindenképp jó lesz.
United Kingdom
Native English, DipTrans, LLB Law Degree
Native in: Hungarian 
, English (Variants: UK, British)
Works in: Hungarian to English
right of contestation on the basis of significantly disproportionate consideration
Also consulted: KJK Kerszöv, magyar-angol-magyar jogi szakszótár
https://medium.com/@tkz/feltűnő-értékaránytalanság-a-magyar-...
Austria
Retd.T&I, Barrister & Austro-Advokat
Native in: English (Variants: British, Scottish)
Works in: Spanish to English, English to Spanish, French to English, and 5 more.
the right to avoid an (BrE) extortionate credit bargain
UK: The 2006 Act repealed the extortionate credit bargains provisions in their entirety, and introduced new provisions to provide consumers with a broad right to challenge “unfair” credit relationships (the new s.140A to s.140D).
IATE: civil law [LAW] Consilium en avoidance Consilium hu megsemmisítés
http://www.proz.com/kudoz/hungarian-to-english/law-contracts/4680275-megtámadási-jog.html
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