retentive

Adjective

• having the power, capacity, or quality of retaining water
  • soils retentive of moisture
    

• having the capacity to retain something

• good at remembering
  • a retentive mind
    
  • tenacious memory
    

Related words

• Synonyms: 
  recollective , long , tenacious
• Antonyms: 
  unretentive , forgetful , short