Antonyms of adj quirky

1 sense of quirky

Sense 1
far-out, kinky, offbeat, quirky, way-out -- (informal terms; strikingly unconventional)

INDIRECT (VIA unconventional, unconventional) -> conventional -- (following accepted customs and proprieties; "conventional wisdom"; "she had strayed from the path of conventional behavior"; "conventional forms of address")
INDIRECT (VIA unconventional) -> conventional -- (unimaginative and conformist; "conventional bourgeois lives"; "conventional attitudes")

Similarity of adj quirky

1 sense of quirky

Sense 1
far-out, kinky, offbeat, quirky, way-out -- (informal terms; strikingly unconventional)
       => unconventional (vs. conventional) (vs. conventional) -- (not conventional or conformist; "unconventional life styles")