| noun | a hypothesis that has been formed by speculating or conjecturing (usually with little hard evidence) “speculations about the outcome of the election” |
| noun | a message expressing an opinion based on incomplete evidence |
| noun | reasoning that involves the formation of conclusions from incomplete evidence |
| verb | to believe especially on uncertain or tentative grounds “Scientists supposed that large dinosaurs lived in swamps” |
| speculate | verb | to believe especially on uncertain or tentative grounds |
| conjectural | adjective | based primarily on surmise rather than adequate evidence |
| conjecture | verb | to believe especially on uncertain or tentative grounds |
| guess | verb | expect, believe, or suppose |
| suppositional | adjective | based primarily on surmise rather than adequate evidence |
| supposititious | adjective | based primarily on surmise rather than adequate evidence |
| suppositious | adjective | based primarily on surmise rather than adequate evidence |
| suppose | verb | express a supposition |
| surmise | verb | imagine to be the case or true or probable |
| hypothetical | adjective | based primarily on surmise rather than adequate evidence |
| hypothecate | verb | to believe especially on uncertain or tentative grounds |
| hypothesize | verb | to believe especially on uncertain or tentative grounds |
| speculative | adjective | not based on fact or investigation |
| speculation | noun | a hypothesis that has been formed by speculating or conjecturing (usually with little hard evidence) |
| speculator | noun | someone who makes conjectures without knowing the facts |
| theorizer | noun | someone who theorizes (especially in science or art) |
| theory | noun | a belief that can guide behavior |
| theoriser | noun | someone who theorizes (especially in science or art) |
| theorisation | noun | the production or use of theories |
| conjecture | noun | reasoning that involves the formation of conclusions from incomplete evidence |
| hypothesis | noun | a message expressing an opinion based on incomplete evidence |
| supposition | noun | the cognitive process of supposing |
| supposal | noun | the cognitive process of supposing |