Antonyms of adj expendable

2 senses of expendable

Sense 1
expendable (vs. unexpendable) -- (suitable to be expended)

unexpendable (vs. expendable) -- (not suitable to be expended)

Sense 2
expendable, spendable -- ((used of funds) remaining after taxes; "spendable income")

INDIRECT (VIA disposable) -> nondisposable -- ((of assets) unavailable for use)

Similarity of adj expendable

2 senses of expendable

Sense 1
expendable (vs. unexpendable) -- (suitable to be expended)
       => consumable -- (may be used up)
       => sacrificeable -- (may be deliberately sacrificed to achieve an objective)
          Also See-> replaceable#1

Sense 2
expendable, spendable -- ((used of funds) remaining after taxes; "spendable income")
       => disposable (vs. nondisposable) -- (free or available for use or disposition; "every disposable piece of equipment was sent to the fire"; "disposable assets")