having many complex parts or details that make it difficult to understand or work with

複雑な, 精巧な
(of clothes and fabrics) having a design that is very detailed and complicated

精緻な (せいちなし), 詳細な (しょうさいな)
(of a system, device, or technique) intricately developed to a high level of complexity

高度に発展した, 洗練された
having more than one possible meaning or interpretation

曖昧な, あいまいな
causing confusion or bewilderment due to being difficult to understand or explain

不可解な (ふかかいな), 困惑させる (こんわくさせる)
presenting difficulties or concerns, often requiring careful consideration or attention

問題を呈する (もんだいをていする), 懸念される (けねんされる)
causing confusion or making something difficult to explain or understand

謎めいた (なぞめいた), 不可解な (ふかかいな)
(of a machine, piece of equipment, etc.) easy to use or understand by ordinary people

使いやすい, ユーザーフレンドリーな
straightforward, simple, and easily understood without any confusion or complexity

明確な, 単純な
simple in design or style and lacking embellishments

質素な, 厳格な
(of a person) avoiding participation or engagement in a situation or activity

関与していない, 無関心な
