noun
long silence; long neglect of correspondence
Literary noun used in formal or old-fashioned contexts to express that one has not met or written to someone for a long time. Often appears in set phrases like 久闊を叙する (to exchange greetings after a long separation).
年賀状で久闊を叙する。
Exchange greetings after a long silence through New Year's cards.
「久闊を叙する」は、長い間会っていなかった人への挨拶として使われる。
The phrase 久闊を叙する is used as a greeting to someone you haven't met in a long time.
ご無沙汰 is the common, everyday expression for 'long silence' or 'neglect of correspondence'. 久闊 is a much rarer, literary equivalent.
The kanji 久 means 'long time' and 闊 means 'wide' or 'spacious', together suggesting a long gap in contact. The exact historical derivation is uncertain; the word is a literary Sino-Japanese compound.