obsolete
How to Use Obsolete
Learner’s notesIn plain EnglishOut of date and no longer in practical use.
Word Forms
more obsolete comparative, obsoleted past tense, obsoletes plural, obsoletes singular, most obsolete superlative
Fill the Gap
Can you complete this real example?
That software became _____ once the new operating system launched.
Etymology
From Latin obsoletus, "worn out, gone out of use", from obsolescere, "to fall into disuse" — the source of the word "obsolescence".