valid
词形变化：
同义词：
sound | cogent | legal | authorized | effective | lawful | true | good | established | well-grounded | adequate | proven | official | factual | efficient | right | effectual | convincing | confirmed | conclusive | reasonable | rational | justifiable | binding | usable | acceptable | legitimate | compelling | persuasive | telling |
反义词：
词义辨析：
同义:
a.合法的; 有效的
sound
true
good
effective
proven
established
cogent
legal
lawful
adequate
authorized
well-grounded
同义参见:
legitimate1
right
factual
confirmed
conclusive
official
efficient
effectual
反义:
a.确凿的; 有效的
invalid
false
fallacious