Copper-bottomed(adjective)
(Thoroughly reliable; certain not to fail.)
Hindi meaning:विश्वसनीय/पक्का
Synonyms: Trustworthy, Reliable, Credible, Truthful, Trusty
Antonyms: Doubtful, False, Unreliable
Example: Because of Copper-bottomed information regarding possible terror attacks, the national threat level has been raised to alert.
Trick to remember: Copper ke wire Copper-bottomed hote hai . 
