Letter: i
- infallibility, absolute certainty, absoluteness, assurance, assuredness, certain knowledge, certainty, certitude, chastity, dead certainty, definiteness, determinacy, determinateness, faultlessness, finish, flawlessness
- infallible, absolute, acceptable, agreeable, beyond all praise, certain, chaste, close, constant, correct, delicate, dependable, direct, effective, efficacious, efficient
- infallibly, absolutely, completely, entirely, fully, ideally, immaculately, just right, perfectly, purely, thoroughly, totally, wholly
- infamous, aberrant, abhorrent, abnormal, abominable, arrant, atrocious, awful, bad, base, beastly, beneath contempt, black, blackguardly, blameworthy, brutal
- infamously, abominably, atrociously, awfully, basely, bestially, brutally, contemptibly, crookedly, deceitfully, despicably, detestably, deviously, disgustingly, dreadful, dreadfully
- infamy, abhorrence, abomination, atrocity, bad, degradation, demotion, desecration, detestation, discredit, disesteem, disgrace, dishonour, disrepute, egregiousness, error
- infancy, babyhood, beginnings, birth, callowness, childhood, commencement, cradle, dawn, dewiness, disability, disablement, disqualification, early, emergence, freshman year
- infant, aboriginal, adolescent, angel, antenatal, apprentice, arrested, babe, baby, baby bunting, babyish, bay, beginner, beginning, budding, callow
- infanticide, collection, fratricide, fungicide, genocide, germicide, herbicide, holocaust, homicide, immolation, incense, insecticide, libation, matricide, murder, oblation
- infantile paralysis, German measles, acute articular rheumatism, ague, alkali disease, anthrax, apoplexy, bacillary dysentery, bastard measles, black death, black fever, brucellosis, bubonic plague, catalepsy, cerebral rheumatism, chicken pox
- infantile sexuality, biological urge, concupiscence, desire, eroticism, hot blood, hot pants, indecency, itch, lust, nymphomania, passion, prurience, sexual desire
- infantile, aboriginal, antenatal, baby, babyish, beginning, budding, childish, childlike, creative, doll-like, elemental, elementary, embryonic, foetal, formative
- infantry tactics, diversion, encirclement, feint, fire tactics, infiltration, investment, shock tactics, strategy, tactics
- infantryman, backpacker, expert rifleman, foot passenger, foot soldier, foot traveller, grenadier, grunt, hiker, hitch-hiker, hoofer, jaywalker, light infantryman, marcher, marksman, musketeer
- infarct, bar, barrier, blank wall, blind alley, block, blockade, bottleneck, choking, clog, congestion, constipation, dead end, embolism, gorge, impasse
- infarction, bar, barrier, blank wall, blind alley, blind gut, block, blockade, blockage, bottleneck, caecum, choking, choking off, clog, congestion, constipation
- infatuate, addict, admirer, adorer, aficionado, allure, attract, beguile, beset, besotted, bewitch, buff, bug, captivate, carry away, cast a spell
- infatuated with, daft, enthusiastic, glowing, infatuated, keen on, sweet
- infatuated, apish, asinine, at fever pitch, batty, beguiled, besotted, bewitched, brainless, buffoonish, captivated, charmed, cock-eyed, crazy, credulous, daffy
- infatuation, affection, ardour, blind faith, bug, calf love, case, craze, crazy fancy, credulity, credulousness, crush, devotion, disposition to believe, dotage, ease of belief
- infeasible, beyond one, impracticable, impractical, inoperable, insuperable, insurmountable, too much for, unachievable, unattainable, unrealisable, unworkable
- infect, abuse, activate, adulterate, afflict, aggrieve, alloy, animate, befoul, bewitch, blight, canker, charge, cheapen, coarsen, condemn
- infected, activated, bad, cankered, charged, contaminated, corrupted, diseased, gangrened, gangrenous, hot, impure, irradiated, morbid, mortified, pathological
- infection, abomination, adulteration, aerial infection, afflatus, airborne infection, animating spirit, animation, animus, atrocity, bad, bane, befouling, blight, carrier, communicability
- infectious disease, abnormality, acute disease, affection, affliction, ailment, allergic disease, allergy, atrophy, bacterial disease, birth defect, blight, cardiovascular disease, chronic disease, circulatory disease, complaint
- infectious hepatitis, appendicitis, bronchitis, bunion, cirrhosis, colitis, encephalitis, enteritis, gastritis, gingivitis, gout, hepatitis, inflammation, jaundice, laryngitis, liver
- infectious mononucleosis, German measles, ague, anthrax, black death, cholera, diphtheria, dysentery, flu, hepatitis, herpes, hookworm, hydrophobia, infantile paralysis, influenza, leprosy
- infectious, catching, communicable, contagious, deadly, destructive, endemic, envenomed, epidemic, infective, irresistible, malign, malignant, miasmal, noxious, pandemic
- infectiousness, carrier, epidemiology, infection, malignancy, poison, taint, toxicity, vector, venom, virulence, virus
- infective, catching, communicable, contagious, deadly, destructive, endemic, epidemic, infectious, malign, malignant, noxious, pandemic, pestiferous, poisonous, sporadic
