out_of_wedlock
1. [ adverb ] of biological parents not married to each other
Synonyms: illegitimately
Examples:

"this child was born illegitimately"

Related terms: legitimately illegitimate illegitimate
2. [ adverb ] of unwed parents
Synonyms: outside_marriage
Examples:

"he was born out of wedlock"

Similar spelling:   out_of_true
  out_of_doors
  out_of_danger