Synonyms of the word

reliable

• adj. Suitable or fit to be relied on; worthy of dependence or reliance; trustworthy.
• adj. (signal processing, of a communication protocol) Such that either a sent packet will reach its destination,…
• n. Something or someone reliable or dependable.

authentic

• adj. Of the same origin as claimed; genuine.
• adj. Conforming to reality and therefore worthy of trust, reliance, or belief.
• adj. (music, of a Gregorian mode) Having the final as the lowest note of the mode.
• adj. (obsolete) authoritative.

certain

• adj. Sure, positive, not doubting.
• adj. (obsolete) Determined; resolved.
• adj. Not to be doubted or denied; established as a fact.
• adj. Actually existing; sure to happen; inevitable.
• adj. Unfailing; infallible.
• adj. Fixed or stated; regular; determinate.
• adj. Not specifically named; indeterminate; indefinite; one or some; sometimes used independently as a noun,…
• pron. (with of) Unnamed or undescribed members (of).
• n. (with "the") Something certain.

dependable

• adj. Able, or easily able to be depended on.
• n. A reliable person or thing.

honest

• adj. (of a person or institution) Scrupulous with regard to telling the truth; not given to swindling, lying,…
• adj. (of a statement) True, especially as far as is known by the person making the statement; fair; unbiased.
• adj. In good faith; without malice.
• adj. (of a measurement device) Accurate.
• adj. Authentic; full.
• adj. Earned or acquired in a fair manner.
• adj. Open; frank.
• adj. (obsolete) Decent; honourable; suitable; becoming.
• adj. (obsolete) Chaste; faithful; virtuous.
• v. (obsolete) To adorn or grace; to honour; to make becoming, appropriate, or honourable.
• adv. (colloquial) Honestly; really.

sure

• adj. Physically secure and certain, non-failing, reliable.
• adj. Certain in one's knowledge or belief.
• adj. Certain to act or be a specified way.
• adj. (obsolete) Free from danger; safe; secure.
• adj. (obsolete) Betrothed; engaged to marry.
• adv. (modal adverb) Without doubt, certainly.
• interj. Yes. (Expresses noncommittal agreement or consent.).
• interj. Yes; of course.

tested

• v. simple past tense and past participle of test.

time-tested

• adj. Tested and proved to be reliable over a period of time.

tried

• adj. Tested, hence, proven to be firm or reliable.
• adj. (law) Put on trial, taken before a lawcourt.
• v. simple past tense and past participle of try.

true

• adj. (of a statement) Conforming to the actual state of reality or fact; factually correct.
• adj. Conforming to a rule or pattern; exact; accurate.
• adj. (logic) Of the state in Boolean logic that indicates an affirmative or positive result.
• adj. Loyal, faithful.
• adj. Genuine.
• adj. Legitimate.
• adj. (of an aim or missile in archery, shooting, golf, etc.) Accurate; following a path toward the target.
• adj. (chiefly probability) Fair, unbiased, not loaded.
• adv. (of shooting, throwing etc) Accurately.
• n. Truth.
• n. The state of being in alignment.
• v. To straighten.
• v. To make even, level, symmetrical, or accurate, align; adjust.

trustworthy

• adj. Deserving of trust, reliable.

trusty

• adj. Reliable or trustworthy.
• n. A trusted person, especially a prisoner who has been granted special privileges.

undeviating

• adj. that does not deviate, veer or turn aside; unswerving.
• adj. that does not change; steady.