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comparative more robustly, superlative most robustly
In a robust manner. quotations examples
This implies the use of two selection criteria – frequency and prominence – both of which are difficult to determine without access to a robustly representative corpus or an extensive and comprehensive citation collection.
2016, James Lambert, “Ornithonymy and Lexicographical Selection Criteria”, in International Journal of Lexicography, volume 30, number 1, pages 39–62