cost-plus 9 Associations

indeterminate (similar term) undetermined (similar term)

open-ended 10 Associations

indeterminate (similar term) undetermined (similar term)

unexplained 11 Associations

undetermined (similar term)

unsettled 9 Associations

doubtful (similar term) tentative (similar term) open (similar term) undecided (similar term) undetermined (similar term) unresolved (similar term) settled (antonym)