theoretical
/ˌθi.əˈɹɛt.ɪ.kəl/ adjective C1- Of or relating to theory; abstract; not empirical.
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“He has his own little methods, which are, if he won’t mind my saying so, just a little too theoretical and fantastic, but he has the makings of a detective in him.
Just yesterday, our communications engineer delivered a brilliant lecture on the theoretical applications of quantum computing.
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