unimpeachably

Beyond any doubt

In a manner that cannot be questioned, challenged, or doubted.

Unimpeachably describes conduct or character so beyond reproach that criticism finds no foothold: She has served unimpeachably for thirty years.

The word often appears in contexts involving integrity, credentials, or sources: The evidence came from unimpeachably reliable witnesses.

flawless

impeccable

Free from any defect

faultlessFree from any defect
perfectWithout any flaw
immaculateCompletely without blemish

exemplary · unblemished · spotless · pristine · irreproachable · beyond question · unassailable · airtight · watertight · bulletproof

emphasis

absolutely

Completely, without exception

categoricallyWithout any qualification
definitivelyWith final authority
unequivocallyIn a completely clear manner

indubitably · undeniably · unquestionably · conclusively · irrefutably · incontestably · demonstrably · certifiably · verifiably · manifestly

integrity

honorable

Having high moral standards

ethicalConforming to moral principles
virtuousMorally excellent, principled
uprightVertical or morally sound

principled · honest · moral · righteous · decent · noble · conscientious · scrupulous · incorruptible · irreproachable

Opposites

credibility/trustworthiness

unimpeachablydubiously

With uncertainty or distrust

questionably · suspiciously · doubtfully · unreliably · disputably

moral/ethical quality

unimpeachablyshamefully

In dishonorable fashion

disgracefully · dishonorably · reprehensibly · deplorably · contemptibly

Family

unimpeachability, unimpeachable

Familiarity: Top 500,000
Profile: Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G