Antonyms of adj nonexistent

1 sense of nonexistent

Sense 1
nonexistent (vs. existent) -- (not having existence or being or actuality; "chimeras are nonexistent")

existent (vs. nonexistent), existing -- (having existence or being or actuality; "an attempt to refine the existent machinery to make it more efficient"; "much of the beluga caviar existing in the world is found in the Soviet Union and Iran")
        => active, alive (predicate) -- (in operation; "keep hope alive"; "the tradition was still alive"; "an active tradition")

Similarity of adj nonexistent

1 sense of nonexistent

Sense 1
nonexistent (vs. existent) -- (not having existence or being or actuality; "chimeras are nonexistent")
       => lacking, absent, missing, wanting -- (nonexistent; "the thumb is absent"; "her appetite was lacking")
       => barren, destitute, devoid, free, innocent -- (completely wanting or lacking; "writing barren of insight"; "young recruits destitute of experience"; "innocent of literary merit"; "the sentence was devoid of meaning")
       => nonextant -- (no longer existing or inaccessible through loss or destruction; "its nonextant original was written on vellum"- G.B.Saul)
       => vanished -- (having passed out of existence; "vanished civilizations")
          Also See-> extinct#2