Final answer:
In the context of describing something as 'strange, different; imaginary', the word 'unreal' is the most fitting choice among the given options.
Step-by-step explanation:
The question asks which word out of the provided options - unreal, sad, efficient, and strong, best fits the description of being 'strange, different; imaginary'. Considering these descriptions, the most appropriate choice from the list is 'unreal'. This word is often used to talk about things that are not real or are beyond what is considered normal. It is contrived by art rather than nature.
'Unreal' can be used to describe something that is strange or different from the usual, and it often indicates that something seems so extraordinary that it's as if it's imaginary or not real. For example, in a sentence, you could say, "The story had an unreal ending that left everyone surprised."
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