Antonyms of adj extendable

1 sense of extendable

Sense 1
extendible, extendable -- (capable of being lengthened)

INDIRECT (VIA long) -> short -- ((primarily spatial sense) having little length or lacking in length; "short skirts"; "short hair"; "the board was a foot short"; "a short toss")

Similarity of adj extendable

1 sense of extendable

Sense 1
extendible, extendable -- (capable of being lengthened)
       => long (vs. short) -- (primarily spatial sense; of relatively great or greater than average spatial extension or extension as specified; "a long road"; "a long distance"; "contained many long words"; "ten miles long")