a hundred percent

Full, absolute agreement

A hundred percent means completely, totally, or with full commitment.

When someone says they're a hundred percent sure, they have no doubt whatsoever.

The phrase often functions as emphatic agreement: Are you coming tonight? A hundred percent.

It can also describe giving maximum effort or being fully invested in something.

Like many expressions of totality, it's frequently hyperbolic—people claim a hundred percent certainty about things they're actually less sure of.

certainty

absolutely

Completely, without exception

positively · certainly · surely · guaranteed · without doubt · no question · conclusively · indubitably · irrefutably · undeniably

completeness

fully

To the complete extent

completely · altogether · utterly · thoroughly · in full · whole · all the way · every bit · to the max · through and through

agreement

unanimous

Complete agreement among all

aligned · in accord · seconded · endorsement · wholeheartedly · solidarity · same page · concurrence · all in · no objection

effort

all out

Complete and unreserved

maximum effort · all in · wholehearted · unstinting · full steam · blood sweat tears · going the distance · no excuses

Opposites
completeness/totality

a hundred percentzero percent

Total lack, numerically

not at all · partially · partly · incompletely · none

certainty/commitment

a hundred percentnot at all

Complete negation phrase

absolutely not · no way · on the fence · wishy-washy · kind of

Family

hundred, percent, hundreds, hundredth, hundredfold, percentage, percentile, percentages, cent

Familiarity
Top 50,000
Profile
Known to kids · Used worldwide · Timeless · Positive · Everyday, not technical · Rated G