experimental (adj.)

• conjectural
• determined
• developmental
• empirical
• experiential
• exploratory
• heuristic
• hit-or-miss
• hypothetical
• preliminary
• preparatory
• probationary
• probative
• probatory
• proving
• provisional
• resolute
• speculative
• temporary
• tentative
• test
• theoretical
• trial
• trial-and-error
• trying
• venturesome
• verificatory
• willing