ご無沙汰

Meaning

1. nvsvi
   not writing or contacting for a while; neglecting (failing) to write (call, visit, etc.); long silence

Example sentences

• ご無沙汰をして、ごめんなさい。

  I am sorry I did not write to you for such a long time.

• ご無沙汰しました。

  I haven't seen you for ages.

• ご無沙汰はお互いさまです。

  I am as much in the wrong as you are about not writing before this.