probing

(verb) question or examine thoroughly and closely. Synonyms: probe, examine.

(verb) examine physically with or as if with a probe. Synonyms: probe, dig into, poke into. Example: "Probe an anthill."

(adj) diligent and thorough in inquiry or investigation. Synonyms: inquisitory, searching. Examples: "A probing inquiry." "A searching investigation of their past dealings."