Strong's #732: arrhostos (pronounced ar'-hroce-tos)
 from 1 (as a negative particle) and a presumed derivative of 4517; infirm:--sick (folk, -ly).
Thayer's Greek Lexicon:
 ̓́̓̔ 
 
  arrhōstos 
 
 1) without strength, weak, sick
 
  Part of Speech: verb
Relation: from G1 (as a negative particle) and a presumed derivative of G4517
 
Usage:
This word is used 5 times:
Matthew 14:14: "and he healed their  sick."
Mark 6:5: "save that he laid his hands upon a few  sick folk, and healed"
Mark 6:13: "anointed with oil many  that were sick, and healed"
Mark 16:18: "they shall lay hands on  the sick, and they shall recover."
1 Corinthians 11:30: "For this cause many are weak and  sickly among you, and"