Not simple but -------
There are many words that can fit here, some of which come to mind are straightforward, explainable, achievable, and many others. What are you looking for?
Based on your response, it seems like you're looking for a word that means "not simple." To find the right word, you can use a thesaurus or online dictionaries.
1. Thesaurus: A thesaurus is a useful tool to find synonyms and antonyms for words. Many online thesauruses, such as Thesaurus.com or Merriam-Webster, provide a list of related words with varying degrees of complexity. In this case, you could search for synonyms of "simple" or "easy" and then look for those with the opposite meaning.
2. Online dictionaries: Some online dictionaries, like Merriam-Webster or Oxford English Dictionary, include definitions, examples, and synonyms for words. You can search for words related to simplicity or complexity to find a suitable word.
3. Word association: Another approach is to brainstorm related words or think of words that evoke the quality you're looking for. For example, "challenging," "intricate," "complex," or "complicated" might fit the description.
Remember, languages are rich and diverse, so there may be various words that convey the meaning you're looking for. An important aspect when searching for words is to consider the context and intended use to ensure the word you choose aligns with the specific message you want to convey.