infallibly

Every single time

Infallibly means without possibility of error or failure.

What someone infallibly does, they do every time without exception: He infallibly arrives late to meetings.

The word often carries ironic weight, since true infallibility is rare: She infallibly picks the slowest checkout line.

precision

accurately

In a correct manner

faultlessly · flawlessly · impeccably · perfectly · correctly · unerringly · rigorously · scrupulously · methodically · systematically

certainty

unerringly

Without making mistakes

indubitably · conclusively · definitively · irrefutably · absolutely · invariably · inevitably · incontrovertibly · undeniably · decidedly

reliability

dependably

Consistently, as expected

faithfully · predictably · securely · stably · trustworthily · unflaggingly · unwaveringly · dutifully · regularly · perpetually

Opposites
reliability/certainty of outcome

infalliblyfallibly

Subject to error

erroneously · unreliably · faultily · uncertainly · imperfectly

frequency/consistency

infalliblysometimes

At irregular intervals

occasionally · inconsistently · uncertainly · unpredictably · sporadically

quality of execution

infalliblyfaultily

With defects present

defectively · imperfectly · shoddily · poorly · clumsily

Phrases
Family

infallible, infallibility

Familiarity
Top 200,000
Profile
Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G