valid
val.id \'val-*d\ aj [MF or ML; MF valide, fr. ML validus, fr. L, strong,
fr. vale]-re 1: having legal efficacy or force; esp : executed with the
proper legal authority and formalities {a ~ contract} 2a: well grounded :
SOUND {a ~ argument} 2b1: having a conclusion correctly derived from
premises {~ argume nt} 2b2: correctly derived from premises {~ inference}
3: EFFECTIVE, EFFICACIOUS {~ methods} mean having such force as to compel
acceptance. VALID implies being supported by objective truth or generally
accepted authority; SOUND implies being based on flawless reasoning and on
solid grounds; COGENT may stress weight of sound argument or evidence or
the lucidness of the presentation of an argument; CONVINCING stresses
having the power of overcoming doubt, opposition, or reluctance; TELLING
suggests having the power of producing quickly the desired effect of an
argument, phrase, or word - val.id.ly av SYN syn VALID, SOUND, COGENT,
CONVINCING, TELLING