Antonyms of adj grandiose

2 senses of grandiose

Sense 1
grandiose -- (impressive because of unnecessary largeness or grandeur; used to show disapproval)

INDIRECT (VIA impressive) -> unimpressive -- (not capable of impressing)

Sense 2
grandiose, hifalutin, highfalutin, highfaluting, hoity-toity, la-di-da -- (affectedly genteel)

INDIRECT (VIA pretentious) -> unpretentious -- (lacking pretension or affectation; "an unpretentious country church"; "her quiet unpretentious demeanor")

Similarity of adj grandiose

2 senses of grandiose

Sense 1
grandiose -- (impressive because of unnecessary largeness or grandeur; used to show disapproval)
       => impressive (vs. unimpressive) -- (making a strong or vivid impression; "an impressive ceremony")

Sense 2
grandiose, hifalutin, highfalutin, highfaluting, hoity-toity, la-di-da -- (affectedly genteel)
       => pretentious (vs. unpretentious) -- (making claim to or creating an appearance of (often undeserved) importance or distinction; "a pretentious country house"; "a pretentious fraud"; "a pretentious scholarly edition")