forgetful

Adjective

• failing to keep in mind
  • forgetful of her responsibilities
    
  • oblivious old age
    

• not mindful or attentive
  • while thus unmindful of his steps he stumbled- G.B.Shaw
    

• (of memory) deficient in retentiveness or range
  • a short memory
    

Related words

• Synonyms: 
  oblivious , unmindful , mindless , unretentive , short
• Antonyms: 
  mindful , aware , retentive , recollective , long , tenacious