persevering
1. [ adjective ] quietly and steadily persevering especially in detail or exactness
Synonyms: diligent
Examples:

"a diligent (or patient) worker" "with persevering (or patient) industry she revived the failing business"

Related terms: patient
Similar spelling:   perseveringly
  persevere
  perseveration
  perspiring
  perseverate
  perseverance
  perspective