Antonyms of adj upside-down

1 sense of upside-down

Sense 1
inverted, upside-down -- (being in such a position that top and bottom are reversed; "a quotation mark is sometimes called an inverted comma"; "an upside-down cake")

INDIRECT (VIA turned) -> unturned -- (not turned; "left no stone unturned")

Similarity of adj upside-down

1 sense of upside-down

Sense 1
inverted, upside-down -- (being in such a position that top and bottom are reversed; "a quotation mark is sometimes called an inverted comma"; "an upside-down cake")
       => turned (vs. unturned) -- (moved around an axis or center)

Synonyms of adv upside-down

1 sense of upside down

Sense 1
upside down -- (in an inverted manner; "the box was lying on the floor upside down")