「難(むずか)しい」 means "difficult" or "hard." It's an い-adjective used to describe something challenging. The sentence uses its past tense, 難しかったです (muzukashikatta desu). For example: この本は難しいです。(This book is difficult.)
「難(むずか)しい」は「difficult」や「hard」の意味のい形容詞です。何かが困難な様子を表します。「この本は難しいです。」(This book is difficult.)
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