Dilapidate refers to the process of falling into a state of ruin or disrepair. Antonyms for dilapidate include words like rejuvenate, restore, renew, repair, and maintain. Rejuvenate suggests the process of making something new or young again. Restore means to bring back to a former or original state. Renew means to make something new again or to restore vitality to something. Repair suggests fixing or mending something that was broken or damaged. Maintain means to keep something in good condition or preserve something from decline. All of these antonyms for dilapidate suggest the opposite of decay, deterioration, or disrepair.