SURE-FIRE Antonyms

• open to doubt or suspicion

• fraught with uncertainty or doubt

• unsettled in mind or opinion

• fraught with uncertainty or doubt

• open to doubt or suspicion

• not convinced

• subject to accident or chance or change

• vague or not clearly defined or stated

• not decided or not known

• subject to question

• able to be refuted

• involving risk or danger

• not financially safe or secure

• lacking or indicating lack of confidence or assurance

• not established beyond doubt; still undecided or unknown

• not established or confirmed

• not certain to occur; not inevitable

• subject to change

• not consistent or dependable

• ambiguous (especially in the negative)

• not capable of being foretold

• unknown in advance

• not occurring at a regular rate or fixed intervals

• not worthy of reliance or trust

• liable to be erroneous or misleading

• dangerously unstable and unpredictable

• lacking a sense of responsibility

• lacking self-confidence

• lacking or indicating lack of confidence or assurance

• evaporating readily at normal temperatures and pressures

• a volatile substance; a substance that changes readily from solid or liquid to a vapor

• liable to lead to sudden change or violence

• marked by erratic changeableness in affections or attachments

• tending to vary often or widely