(a.) Capable of being numbered.

anticipatable appraisable appreciable assessable computable countable dependable determinable divinable estimable faithful faithworthy fast fathomable firm foreknowable foreseeable foretellable gaugeable improbable invincible measurable mensurable meterable noticeable numberable numerable perceptible precognizable predictable probable quantifiable quantizable reckonable reliable secure solid sound stable staunch steadfast steady substantial sure surefire trustworthy trusty unfailing well-founded well-grounded