to observe or inspect carefully or critically
to interrogate
to determine the aptitude, skills or qualifications of someone by subjecting them to an examination
to check the health or condition of something or someone
To reach a partly (or totally) unqualified conclusion.
to suppose (introducing a proposition of uncertain plausibility).
To solve by a correct conjecture; to conjecture rightly.
To think, conclude, or decide (without a connotation of uncertainty). Usually in first person: "I guess".
A prediction about the outcome of something, typically made without factual evidence or support.