inquisitory
1. [ adjective ] diligent and thorough in inquiry or investigation
Synonyms: searching probing
Examples:

"a probing inquiry" "a searching investigation of their past dealings"

Related terms: inquiring
Similar spelling:   inquisitor
  inquisitorial
  inquisitively
  inquisitive
  inquisition
  insistency
  insisting
  insistently
  insistent
  injustice