Speculative – Based on unproven theory and conjecture rather than knowledge

(Pronounced spek-yuh-luh-tiv)

To remember the definition of the word speculative, use the following mnemonic:

He believed that the spectre of a young relative (speculative) haunted the family home, but this was based on conjecture rather than knowledge.

Examples of speculative in a sentence

Theories on life and it's origins are highly speculative.

The murder mystery involved many speculative alibis that threw the audience off the scent.

The office block was built as a speculative venture.