The term "decks out" refers to adorning or decorating something, often in a fancy or extravagant way. The opposite or antonyms of "decks out" would be terms that imply removing or simplifying decoration, such as "stripped down," "minimalist," or "bare-bones." Other potential antonyms could include terms related to an unkempt or messy appearance, such as "shabby," "unfurnished," or "untidy." Alternatively, words like "plain," "unadorned," or "basic" could be considered antonyms of "decks out" because they connote a lack of ornamentation or embellishment. Whatever the antonym, it would convey a sense of simplicity or minimalism in contrast to the elaborate decorations implied by "decks out.