FIRSTBORN Antonyms There are 2 antonyms of the word firstborn. (opposite meanings)Did you mean?Definition of FIRSTBORNSynonyms of FIRSTBORNAlso try opposite words for..firstbornsBest Opposite Words For FIRSTBORNTop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb RankWordSave?Synonyms..UsageType1lastbornnoun, adjectiven, adj2youngestadjectiveadj Alternatives for LASTBORN Words (7)babybenjaminbittyjuniorlittlestsmallestyoungestOpposite words for lastborn Alternatives for YOUNGEST Words (13)immatureyouthfuljuniorjuvenilenewoffspringunderdevelopedundevelopedunseasoneduntesteduntriedvernalyouthPhrases (11)brigham youngcy youngdanton true youngedward younglester willis younglester youngloretta youngpres youngthomas youngwhitney moore young jr.whitney youngOpposite words for youngest