ἰσχυρῶς (ischyros)
ἰσχυρῶς is an Ancient Greek form of ἰσχυρός, meaning “strong, powerful”. It is the adverb.
Found 303 times in the Ancient Greek texts on Socratos.
Where it is used
Thucydides, History of the Peloponnesian War 1.69.3: καὶ ἐπιστάμεθα οἵᾳ ὁδῷ οἱ Ἀθηναῖοι καὶ ὅτι κατ’ ὀλίγον χωροῦσιν ἐπὶ τοὺς πέλας. καὶ λανθάνειν μὲν οἰόμενοι διὰ τὸ ἀναίσθητον ὑμῶν ἧσσον θαρσοῦσι, γνόντες δὲ εἰδότας περιορᾶν ἰσχυρῶς ἐγκείσονται.
All forms of ἰσχυρός (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Liddell-Scott-Jones, A Greek-English Lexicon (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.