Persistent and Consistent

adjective

• Never-ceasing.
  • usage: "the relentless beat of the drums"
  • synonyms: relentless, unrelenting
• Continually recurring to the mind."haunting memories"; "the cathedral organ and the distant voices have a haunting beauty- Claudia Cassidy
  • synonyms: haunting
• Retained; not shed.
  • usage: "persistent leaves remain attached past maturity"; "the persistent gills of fishes"
  • synonyms: lasting
• Stubbornly unyielding.
  • usage: "dogged persistence"; "dour determination"; "the most vocal and pertinacious of all the critics"; "a mind not gifted to discover truth but tenacious to hold it- T. S. Eliot; "men tenacious of opinion"
  • synonyms: dogged, dour, pertinacious, tenacious, unyielding

• (a.) Inclined to persist; having staying qualities; tenacious of position or purpose.
• (a.) Remaining beyond the period when parts of the same kind sometimes fall off or are absorbed; permanent; as, persistent teeth or gills; a persistent calyx; -- opposed to deciduous, and caducous.

adjective

• Sometimes followed by `with'. ( in agreement or consistent or reliable) "testimony consistent with the known facts"; "I have decided that the course of conduct which I am following is consistent with my sense of responsibility as president in time of war- FDR
• Capable of being reproduced.
  • usage: "astonishingly reproducible results can be obtained"
  • synonyms: reproducible
• Marked by an orderly, logical, and aesthetically consistent relation of parts.
  • usage: "a coherent argument"
  • synonyms: coherent, logical, ordered
• The same throughout in structure or composition.
  • usage: "bituminous coal is often treated as a consistent and homogeneous product"
  • synonyms: uniform

• (a.) Possessing firmness or fixedness; firm; hard; solid.
• (a.) Having agreement with itself or with something else; having harmony among its parts; possesing unity; accordant; harmonious; congruous; compatible; uniform; not contradictory.
• (a.) Living or acting in conformity with one's belief or professions.