reliable

1 of 2

adjective

re·​li·​able ri-ˈlī-ə-bəl 

1

: suitable or fit to be relied on : dependable

2

: giving the same result on successive trials

reliableness noun

reliably

ri-ˈlī-ə-blē 

adverb

reliable

2 of 2

noun

: one that is reliable

Synonyms of reliable

Adjective

• responsible
• safe
• true
• good
• steady
• dependable
• solid
• trustworthy
• secure
• loyal

Examples of reliable in a Sentence

Adjective

He's not very reliable. You can't always count on him to do what he says he'll do.

We can't write a report without reliable data.

We need more reliable information before we can take action.

Recent Examples on the Web

Adjective

One of the most reliable options may be to dispute charges through your credit card company. —Kayla Hayempour, NBC news, 3 May 2026

Eaton makes a bunch of products used in data centers that collectively feed the power-hungry server racks with consistent and reliable electricity. —Kevin Stankiewicz, CNBC, 3 May 2026

Noun

With 50 seconds remaining in the Warriors’ play-in game against the host Clippers at Intuit Dome, Golden State’s two aging Hall of Famers went back to old reliable. —Joseph Dycus, Mercury News, 16 Apr. 2026

The explorers, in over their heads, ran for cover to an old reliable, and arrived at the house’s whiskey sour: a sweet, frothy delicacy topped with exquisitely marbled foam. —Sheldon Pearce, New Yorker, 20 Feb. 2026

Word History

First Known Use

Adjective

1569, in the meaning defined at sense 1

Noun

1852, in the meaning defined above

Rhymes for reliable

• classifiable
• justifiable
• modifiable
• notifiable
• satisfiable
• specifiable
• undeniable
• unreliable
• verifiable
• emulsifiable
• identifiable
• unclassifiable

Kids Definition

reliable

adjective

re·​li·​able

ri-ˈlī-ə-bəl

: fit to be trusted : dependable

reliableness noun

reliably

-blē

adverb

Medical Definition

reliable

adjective

re·​li·​able ri-ˈlī-ə-bəl 

: giving the same result on successive trials

a reliable psychological test