Antonyms for trial

experimental:

proven, definite, known.

noun:

tried, advanced, proved, final, established, proven, permanent, standard, developed, accepted, definitive, tested, decisive, conclusive.

legal proceeding:

acquittal.

test:

peace, happiness, idleness, laziness, abstention.

trouble, big problem:

profit, convenience, joyousness, cheer, felicity, advantage, contentment, relief, delight, benefit, health, aid, pleasure, fortune, joy, ease, joyfulness, good fortune, calm, good luck, blessing, favor, help, comfort.