estimable has 4 distinct synonyms spread across 2 of its 3 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is contemptible.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
deserving of respect or high regard
deserving of esteem and respect
“all respectable companies give guarantees”
may be computed or estimated
“a calculable risk”
Synonyms, antonyms and the broader and narrower relations for estimable come from Princeton University’s WordNet. Full sources and licences.