жесткий
From LSJ
ἀσκέειν, περὶ τὰ νουσήματα, δύο, ὠφελέειν, ἢ μὴ βλάπτειν → strive, with regard to diseases, for two things — to do good, or to do no harm | as to diseases, make a habit of two things — to help, or at least, to do no harm
Russian > Greek
ἀτέραμνος, περισκελής, ἄσαντος, σκληρόφθαλμος, σύμπυκνος, κακόστρωτος, ξυλώδης, ἱμαντώδης, ψαφαρός, στριφνός, στερεός, σκιρός, στερέμνιος, στερρός, δυστηκτος, τραχύς, τρηχύς, ἀντίτυπος