searching in WordNet English dictionary

1. diligent and thorough in inquiry or investigation
   "a probing inquiry"; "a searching investigation of their past dealings"
   inquisitory  probing  searching 
   
2. exploring thoroughly
   searching 
   
3. having keenness and forcefulness and penetration in thought, expression, or intellect
   "searching insights"; "trenchant criticism"
   searching  trenchant