Lexical Definition

‎ἄῤῥωστος‎ árrhōstos (ar'-hroce-tos) ill G:A
from ‎Α‎ (as a negative particle) and a presumed derivative of ‎ῥώννυμι‎

sick (folk, -ly).

Usage: 5 forms in 7 verses
Form Translated As     In Verse(s)
ἄρρωστοι sick 1Cor.11.30
ἀρρώστουσ sick Matt.14.14Mark.6.13Mark.16.18
ἀρρώστοισ sick Mark.6.5
άρρωστόσ he is ill LXX.1Kgs.14.5
άρρωστον ill LXX.Mal.1.8

Abbott-Smith

ἄρρωστος, -ον (< ἀ- neg., ῥώννυμι), [in LXX: III Ki 14:5Α, Ma 1:8 (חלה), Si 7:35*;]
feeble, sickly: Mt 14:14, Mk 6:5, 13 [18](/btb/interlinear/41%20-%20Mark/16/Mark.16.18.html)], I Co 11:30.†

Abbott-Smith References

Book Refs
1 Kings 14:5
Malachi 1:8
Matthew 14:14
Mark 6:5 · 6:13 · 16:18
1 Corinthians 11:30

Liddell-Scott-Jones

ἄρρωστος-ος, ον,

(ῥώννυμι) weak, sickly, [Refs 4th c.BC+]. adverb -τως, ἔχειν[Refs 5th c.BC+]

__2 in moral sense, weak, feeble, τὴν ψυχήν[Refs 5th c.BC+]
__3 ἀρρωστότερος ἐς τὴν μισθοδοσίαν remiss in payment, [Refs 5th c.BC+]