moral fibre 
noun
See fibre (sense 1).
Synonyms
strength of character, resolution, fortitude, resolve, backbone, spine, mettle, firmness of purpose, toughness of spirit, steel;
British Dunkirk spirit
- knifefish
- knife grinder
- knife-like
- knifeman
- knife pleat
- knifepoint
- knifer
- knife rest
- knife-thrower
- knife-throwing
- knight
- knightage
- knight bachelor
- Knight, Bobby
- knight commander
- knight errant
- knight-errantry
- knighthood
- knight in shining armour (or knight on a white charger)
- Knight, John S.
- knightlike
- knightliness
- knightly
- knight marshal
- knight of the road