also: しがたい
i-adjective
hard to do; difficult to do
Attaches to the masu-stem of verbs to express that an action is difficult or hard to perform. The reading しにくい is the most common; しがたい is more formal/literary and often used in fixed expressions like 想像しがたい (hard to imagine).
この説明書はわかりにくい。
This manual is hard to understand.
彼の行動は理解
His behavior is hard to understand.