Antonyms of adj flirtatious

1 sense of flirtatious

Sense 1
coquettish, flirtatious -- (like a coquette)

INDIRECT (VIA sexy) -> unsexy -- (not sexually aroused or arousing)

Similarity of adj flirtatious

1 sense of flirtatious

Sense 1
coquettish, flirtatious -- (like a coquette)
       => sexy (vs. unsexy) -- (marked by or tending to arouse sexual desire or interest; "feeling sexy"; "sexy clothes"; "sexy poses"; "a sexy book"; "sexy jokes")

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