Synonyms of speculative in English:

speculative


See definition of speculative

adjective

1‘any discussion of the question is largely speculative’

SYNONYMS

conjectural, suppositional, theoretical, hypothetical, based on guesswork, putative, academic, notional, abstract

tentative, unproven, untested, unfounded, groundless, unsubstantiated

rare ideational, suppositious, suppositive

ANTONYMS

proven

2‘a speculative investment’

SYNONYMS

risky, hazardous, unsafe, uncertain, unpredictable

informal chancy, dicey, iffy

British informal dodgy

ANTONYMS

safe