fashion, practise, habit, and usage
fastidious, proud, gracious, and poised
fate, fortune, contingency, and opportunity
fatuous, dreamy, moony, and impracticable
fear, timidity, cowardice, and pusillanimity
feeble, languid, timid, and irresolute
ferocious, restive, savage, and uncultivated
fervent, enthusiastic, anxious, and zealous
fiction, fancy, falsehood, and fabrication
fine, fragile, delicate, and dainty