Usage: 5 forms in 13 verses
Form Translated As     In Verse(s)
ηρρώστησεν Hezekiah became ill LXX.2Chr.32.24
Hezekiah was infirm LXX.2Kgs.20.1 • LXX.2Kgs.20.12
became ill LXX.1Kgs.17.17
was ill LXX.1Kgs.14.1
ηρρώστησε became as ill LXX.2Sam.13.6
became ill LXX.2Kgs.13.14
he was ill LXX.2Sam.12.15
was infirm LXX.2Kgs.1.2
ηρρώστει he was infirm LXX.2Kgs.8.29 • LXX.2Chr.22.6
αρρωστών infirm LXX.2Kgs.8.7
αρρωστείν to be ill LXX.2Sam.13.2

Liddell-Scott-Jones

ἀρρωστέω (arrōsteō) be ill G:V

ἀρρωστέω-έω,

to be unwell, [ἀρρωστέωίην, ἀρρώστημα, 5th c.BC: Hippocrates Medicus “Κωακαὶ προγνώσιες” 579, 4th c.BC: Aristoteles Philosophus “Rhetorica” 1372a28.">Refs 5th c.BC+]