adj

• (of words, equipment, etc.) No longer in use; gone into disuse; disused or neglected (often in favour of something newer).
  "Speedy, worldwide, accessible delivery of news through the Web has made newspapers obsolete."
• (biology) Imperfectly developed; not very distinct.
  "These two birds somewhat closely resemble each other, but the Sedge Warbler is russet-brown above, the feathers with dark centres, the pale buff eyestripe is very clearly defined, and the underparts are buffish white; the Reed Warbler is more olive on the upper parts, the feathers having no dark centres, the underparts are more inclined to buff, and the eyestripe is nearly obsolete."

verb

• (transitive) To cause to become obsolete.
  "This software component has been obsoleted."