All expendable antonyms

adjective expendable

• indispensable — absolutely necessary, essential, or requisite: an indispensable member of the staff.
• important — of much or great significance or consequence: an important event in world history.
• necessary — being essential, indispensable, or requisite: a necessary part of the motor.
• useful — being of use or service; serving some purpose; advantageous, helpful, or of good effect: a useful member of society.
• durable — able to resist wear, decay, etc., well; lasting; enduring.