frequently_asked_questions_files/Oxford Thesaurus.pdf

infest v. invade, plague, beset, overrun, overspread, flood, swarm
over, inundate, pervade, permeate, penetrate, infiltrate:
Mosquitoes infested this area before the swamp was drained.
infidel n. unbeliever, heathen, disbeliever, heretic, pagan, agnostic,
atheist, nullifidian, freethinker: Thousands of the fanatics
swarmed over the infidels, slaughtering them mercilessly.
infidelity
n. 1 unfaithfulness, faithlessness, treachery, traitorousness,
disloyalty, perfidy, falseness, apostasy, heresy: The
infidelity of his supporters brought about his downfall. 2
adultery, cuckoldry; affair, liaison, amour, Colloq cheating:
Infidelity is a common cause of marriage break-up. She forgave
him his many infidelities.
infinite adj. 1 boundless, vast, limitless, unlimited, illimitable,
endless, interminable, indeterminable, indeterminate,
inestimable, astronomical, numberless, multitudinous,
uncountable, uncounted, innumerable, incalculable,
inexhaustible, immense, enormous, immeasurable, measureless,
bottomless, unfathomable: They hurtled through infinite space
at the speed of light. We do what we can, but our resources are
not infinite. In his infinite wisdom, God made the garden slug.
2 eternal, everlasting, perpetual, endless, unending,
inexhaustible, undying, never-ending: It is difficult to
conceive of time as being anything but infinite, without
beginning or end. With infinite patience she reassembled the
pieces of the vase.
infirm adj. 1 ill, indisposed, debilitated, frail, fragile, weak,
feeble, weakened, ailing, decrepit, enfeebled, failing, wasted,
on the decline, sick, sickly, unwell, lame, crippled: Campbell
is infirm and unable to travel. 2 shaky, flimsy, wobbly,
wobbling, doddering, unstable, faltering, vacillating, wavering,
unsteady, unsteadfast, inconstant, changeable, irresolute: We
must find stalwart recruits, recruits who are not infirm of
purpose.
infirmary n. clinic, hospital, sickbay, first-aid station; dispensary,
Brit nursing home, surgery: The infirmary is able to deal only
with emergencies, not with long-term care.