provisional (adj.)

• accidental
• adventitious
• aleatory
• alternate
• alternative
• casual
• circumstantial
• conditional
• contingent
• counterfeit
• dangerous
• dependent
• desultory
• dummy
• empirical
• equivalent
• ersatz
• experimental
• fake
• fixed
• forehanded
• foresighted
• forethoughtful
• given
• hazardous
• heuristic
• hit-or-miss
• imitation
• improvised
• incidental
• inessential
• infirm
• insecure
• insubstantial
• interim
• jury-rigged
• makeshift
• mock
• nonessential
• occasional
• perilous
• phony
• precarious
• precautional
• precautionary
• preparative
• preparatory
• prerequisite
• probationary
• probative
• probatory
• propaedeutic
• provident
• proving
• provisory
• qualified
• risky
• rough-and-ready
• rough-and-tumble
• secondary
• shaky
• shifting
• shifty
• slippery
• spare
• specified
• stated
• stipulatory
• substitute
• temporary
• tentative
• test
• ticklish
• token
• transitional
• treacherous
• trial
• trial-and-error
• trying
• undependable
• unessential
• unreliable
• unsound
• unstable
• unsteady
• unsubstantial
• unsure
• untrustworthy
• utility
• verificatory
• vicarious