に難くない【にかたくない】

The expression に難くない (にかたくない) is a formal, literary construction meaning "it is not hard to ~" or "it is easy to ~." It is used to express that something can be easily done mentally – that is, easily imagined, guessed, understood, or predicted. It does not refer to physical ease of action.

This grammar point is almost exclusively used with a small set of verbs related to mental processes, most commonly:

• そうぞう想像（そうぞう）– imagination → 想像に難くない ("not hard to imagine")
• すいそく推測（すいそく）– conjecture → 推測に難くない ("not hard to guess")
• りかい理解（りかい）– understanding → 理解に難くない ("not hard to understand")
• よそう予想（よそう）– prediction → 予想に難くない ("not hard to predict")
• さっする察する（さっする）– to infer → 察するに難くない ("not hard to infer")

The structure is Noun + に難くない (for する-verb stems) or Verb[dictionary form] + に難くない (for verbs like さっする察する).

Nuance and usage

This expression carries a formal, written tone and appears frequently in essays, news commentary, speeches, and literary works. It is rarely used in casual conversation.

The nuance is that given the circumstances, anyone could easily arrive at the same conclusion. It implies that the situation is so obvious or natural that no special effort is needed to understand it.

Common mistake

Be careful not to confuse がたい難い (かたい, "difficult") in this expression with むずかしい難しい (むずかしい). The reading here is always かたくない, not むずかしくない. Also note that がたい難い (かたい/がたい) appears in other grammar patterns like ～がたい (e.g., しんじがたい信じがたい, "hard to believe"), but に難くない is a distinct fixed expression.