expression, i-adjective
not hard to ...; it is easy to imagine/understand that ...
Fixed expression used after a noun or the dictionary form of a verb to mean 'it is not difficult to (imagine/understand/etc.)'. Often used with verbs like 想像する, 理解する, or 察する. Formal and somewhat literary.
彼の驚きは想像に難くない。
It is not hard to imagine his surprise.
その結果がどうなったかは察するに難くない。
It is easy to guess what the result was.