1. intrude on to intrude upon, infringe, encroach on, violate
  2. intrusion entrance by force or without permission or welcome
  3. untrodden lacking pathways
  4. intrude enter uninvited
  5. intruder someone who enters a place or situation without permission
  6. intruding projecting inward
  7. intrauterine within the womb
  8. entertain provide amusement for
  9. intrados the interior curve of an arch
  10. intermittent stopping and starting at irregular intervals
  11. intertwine spin, wind, or twist together
  12. intron sequence of a eukaryotic gene's DNA that is not translated into a protein
  13. introduce bring something new to an environment
  14. intrinsic belonging to a thing by its very nature
  15. introduction the act of beginning something new
  16. undertone a subdued or implied meaning of an utterance
  17. induration any pathological hardening or thickening of tissue
  18. intranet a restricted computer network
  19. intern someone who works for an expert to learn about a job
  20. intervene be placed or located between other things