Reverse Dictionary: UNBORN

 ADJECTIVES
1600 — UNBRED unborn → obs.

NOUNS – PERSON
1601 — YOUNG BONES an unborn child 
1635 — HANS-IN-KELDER an unborn child → obs.
1751 — JACK IN THE LOW CELLAR an unborn child 
..19C — LAP-FULL an unborn child → Brit. sl.
..20C — LITTLE STRANGER an unborn foetus, esp. one that is illegitimate or of unknown paternity → sl.
..20C — PUDDING  an unborn child → Brit. sl.