noun, noun or participle which takes 'suru', intransitive verb
long silence; neglecting to keep in touch
Used when someone has not written, called, or visited for a long time. Often appears in set phrases like ご無沙汰しています (I've been out of touch) or 無沙汰を詫びる (apologize for the silence).
長い間ご無沙汰してすみません。
I'm sorry for not being in touch for so long.
彼からはもう半年も無
I haven't heard from him for half a year now.