Antonyms of adj breathtaking

1 sense of breathtaking

Sense 1
breathless, breathtaking -- (tending to cause suspension of regular breathing; "a breathless flight"; "breathtaking adventure")

INDIRECT (VIA exciting) -> unexciting -- (not exciting; "an unexciting novel"; "lived an unexciting life")

Similarity of adj breathtaking

1 sense of breathtaking

Sense 1
breathless, breathtaking -- (tending to cause suspension of regular breathing; "a breathless flight"; "breathtaking adventure")
       => exciting (vs. unexciting) -- (creating or arousing excitement; "an exciting account of her trip")