1) Earning last place 2) Last at belmont park 3) Last at Daytona 4) Last to finish 5) Least fleet 6) Least progressive 7) Least sharp 8) Least speedy 9) Like the last in a dash 10) Like the last place finisher 11) Most adagio 12) Most deliberate 13) Most like a snail 14) Most obtuse 15) Most slowly 1) Pokiest 
[adv] - most slowly
adverb most slowly