| capricious(adjective, nervous, shy, fearful, irresolute) |
| contingent(adjective, conditional, experimental) |
| probative(adjective, experiment, experimental) |
| vacillant(adjective, shy, doubtful, decide, hesitant) |
| empirical(adjective, essay, experimental) |
| provisory(adjective, limited, conditional, experimental) |
| dependent(adjective, conditional, experimental) |
| faltering(adjective, weak, uncertain, shy, doubtful) |
| doubtful(adjective, open, weak, uncertain, shy) |
| provisionary(adjective, unsettled, temporary, speculative, contingent) |
| vacillating(adjective, weak, uncertain, nervous, shy) |
| ambivalent(adjective, open, uncertain, shy, doubtful) |
| exploratory(adjective, new, unsettled, trial, untried) |
| halfhearted(adjective, weak, uncertain, doubtful, hesitant) |
| hit-or-miss(adjective, experimental) |
| infirm(adjective, weak, indecisive, irresolute, vacillating) |
| insecure(adjective, uncertain, doubtful, vague, unsure) |
| investigative(adjective, experimental) |
| vacillatory(adjective, uncertain, shy, doubtful, decide) |
| careful(adjective, thoughtful, vague, prudent, ambiguous) |