Faint as an adjective means barely perceptible, slight, and in medical terms, close to losing consciousness: “Even the faint whiff of eggs was enough to make me feel faint”. The verb to faint indicates a sudden loss of consciousness: “She saw the horrible sight and fainted, falling to the floor, out cold”. Faint hearted – means lacking conviction or courage – another of our extensions into metaphor.
A feint (not a fient) is a pretended or deceptive thrust or blow in the sports of boxing fencing (or in general fighting). “I feinted a punch to the left and ran around him as he ducked”. It is also, in my favoured usage, the term for paper which has been printed with faint lines to give a guide for handwriting – you will see “Narrow feint” or “Wide feint” printed on the front of notebooks or pads of paper.