Antonyms of adj unadventurous

1 sense of unadventurous

Sense 1
unadventurous (vs. adventurous) -- (lacking in boldness)

adventurous (vs. unadventurous), adventuresome -- (willing to undertake or seeking out new and daring enterprises; "adventurous pioneers"; "the risks and gains of an adventuresome economy")
        => audacious, daring, venturesome, venturous -- (disposed to venture or take risks; "audacious visions of the total conquest of space"; "an audacious interpretation of two Jacobean dramas"; "the most daring of contemporary fiction writers"; "a venturesome investor"; "a venturous spirit")
        => sporting -- (involving risk or willingness to take a risk; "a sporting chance"; "sporting blood")
        => swaggering, swashbuckling -- (flamboyantly adventurous)

Similarity of adj unadventurous

1 sense of unadventurous

Sense 1
unadventurous (vs. adventurous) -- (lacking in boldness)
       => safe -- ((of an undertaking) secure from risk)
          Also See-> cautious#1; timid#1