Antonyms of adj substandard

1 sense of substandard

Sense 1
deficient, inferior, substandard -- (falling short of some prescribed norm; "substandard housing")

INDIRECT (VIA nonstandard) -> standard -- (conforming to or constituting a standard of measurement or value; or of the usual or regularized or accepted kind; "windows of standard width"; "standard sizes"; "the standard fixtures"; "standard brands"; "standard operating procedure")

Similarity of adj substandard

1 sense of substandard

Sense 1
deficient, inferior, substandard -- (falling short of some prescribed norm; "substandard housing")
       => nonstandard (vs. standard) -- (varying from or not adhering to a standard; "nonstandard windows"; "envelopes of nonstandard sizes"; "nonstandard lengths of board")