What is the opposite of tried and tested?

Need antonyms for tried and tested? Here's a list of opposite words from our thesaurus that you can use instead.

Adjective
Opposite of proven to be good or workable
Adjective
Opposite of being faithful and devoted in one's support
“Edward now regarded the struggle as the suppression of a rebellion of disloyal subjects.”
Adjective
Opposite of reliable and unfailing
“Your lack of empathy is a testament to your flawed virtue, of which you should be ashamed.”
Adjective
Opposite of having or demonstrating an unwavering devotion toward someone or something
“I'm pretty fickle when it comes to supporting my country during the Olympics.”
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