PROBING
\pɹˈə͡ʊbɪŋ], \pɹˈəʊbɪŋ], \p_ɹ_ˈəʊ_b_ɪ_ŋ]\
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diligent and thorough in inquiry or investigation; "a probing inquiry"; "a searching investigation of their past dealings"
By Princeton University