1. Not thought over and arranged systematically in the mind; not absorbed or assimilated mentally
   "an undigested mass of facts gathered at random" 
2. Not digested
   "undigested food"

See also: indigestible, ununderstood

• sone
• song
• song and dance
• Song dynasty
• Song of Solomon
• Song of Songs
• song sparrow
• song thrush
• songbird
• songbook
• songfest
• songful
• songfulness
• Songhai
• songlike
• songster
• songstress
• songwriter
• sonic
• sonic barrier
• sonic boom
• sonic delay line
• sonic depth finder
• sonnet
• sonneteer