Synonyms for Estimable (same or very similar meaning)
WordNet sense 1 (deserving of esteem and respect):
good, honorable, respectable
WordNet sense 2 (having a good reputation):
reputable
WordNet sense 3 (deserving of the highest esteem or admiration):
admirable
WordNet sense 4 (may be computed or estimated):
computable
WordNet sense 5 (capable of being calculated or estimated):
calculable
From the ODE community, based on WordNet
add/edit