Similar words
vetusto
vetusto is more literary and emphatic, "ancient, decrepit"; antiguo is more everyday, "old, ancient."
Similar in other languages
Portuguese
antigo
Spanish antiguo and Portuguese antigo both directly mean old, from a past time.
Practice
1 What does antiguo mean?
ancient, old
2 Fill the gap: Vivo en una casa ___.
Full sentence: Vivo en una casa antigua. (I live in an old house.)
3 Which fingerprint chart matches antiguo?
antiguo: neutral register, core frequency, general domain, neutral connotation.