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valid 
1 acceptable, binding, cogent, conclusive, convincing, efficacious, efficient, good, just, logical, powerful, sensible, sound, substantial, telling, weighty, well-founded, well-grounded 
2 authentic, bona fide, genuine, in force, lawful, legal, legally binding, legitimate, official, signed and sealed 
 
Antonyms  
 
1 baseless, bogus, fallacious, false, illogical, sham, spurious, unacceptable, unfounded, unrealistic, unrecognized, untrue, weak 
2 illegal, inoperative, invalid, unlawful, unofficial 



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