The term UNMEASURABLE is an adjective that means 'too great or numerous to be measured or calculated'. Its synonyms, IMMEASURABLE (12 letters), INORDINATE (10 letters), and IMMODERATE (10 letters) all have similar meanings. IMMEASURABLE means 'incapable of being measured or quantified', INORDINATE means 'excessive or beyond reasonable limits', and IMMODERATE means 'exceeding reasonable bounds'. All three words can be used to describe something that is too great or too numerous to be measured.