((i)) Important is a synonym of major, and it ends with 'T' to start the chain. ((ii)) Trouble is a synonym of problem, beginning with 'T' (last letter of IMPORTANT). ((iii)) Level is an antonym of uneven, beginning with 'L' (last letter of TROUBLE). ((iv)) Postal is related to post office, beginning with 'P' (last letter of LEVEL). ((v)) Ethical relates to moral duty, beginning with 'E' (last letter of POSTAL). ((vi)) Temporal means related to time, beginning with 'T' (last letter of ETHICAL). ((vii)) Affluent is a synonym of prosperous, beginning with 'A' (last letter of TEMPORAL). ((viii)) Existential relates to existence or being alive, beginning with 'E' (last letter of AFFLUENT).