All maintainable antonyms
main·tain
M m adj maintainable
- unimaginable — capable of being imagined or conceived.
- unthinkable — inconceivable; unimaginable: the unthinkable size of the universe.
- untenable — incapable of being defended, as an argument, thesis, etc.; indefensible.
- certain — If you are certain about something, you firmly believe it is true and have no doubt about it. If you are not certain about something, you do not have definite knowledge about it.
- unjustifiable — capable of being justified; that can be shown to be or can be defended as being just, right, or warranted; defensible: justifiable homicide.
- irrational — without the faculty of reason; deprived of reason.
- unbelievable — too dubious or improbable to be believed: an unbelievable excuse.
- unreasonable — not reasonable or rational; acting at variance with or contrary to reason; not guided by reason or sound judgment; irrational: an unreasonable person.