doubtless

1 of 2

adverb

doubt·​less ˈdau̇t-ləs 

1

: without doubt

2

: probably

doubtless

2 of 2

adjective

: free from doubt : certain

doubtlessly adverb

doubtlessness noun

Synonyms

Adverb

• all right
• alright
• assuredly
• certainly
• clearly
• definitely
• easily
• forsooth
• hands down
• inarguably
• incontestably
• incontrovertibly
• indeed
• indisputably
• plainly
• really
• so
• sure
• surely
• truly
• unarguably
• undeniably
• undoubtedly
• unquestionably

Adjective

• assured
• certain
• clear
• cocksure
• confident
• implicit
• positive
• sanguine
• sure

Examples of doubtless in a Sentence

Adverb

she is doubtless the one and only girl for me

doubtless you have heard this story before, but I'll tell it anyway

Adjective

another one of his doubtless predictions that will never come true

Recent Examples on the Web

Adverb

Though doubtless a crucial aspect of many of the most dramatic occurrences in human history, letter-writing is not the most cinematic of activities. —Jessica Kiang, Variety, 5 Sep. 2024

The West’s commitment to Ukraine may well flag as costs and risks increase and military stocks run low, but that has yet to happen, doubtless to Putin’s surprise. —Rajan Menon, Foreign Affairs, 12 Apr. 2023

Adjective

Even moderately keen cornering produces body roll and would bring doubtless admonition from the rear seats. —Mike Duff, Car and Driver, 18 Aug. 2023

And the all-boffo, all-the-time production is exhausting (which is doubtless why the rare quiet moments stand out). —Bill Goodykoontz, The Arizona Republic, 29 Nov. 2022

Word History

First Known Use

Adverb

14th century, in the meaning defined at sense 1

Adjective

14th century, in the meaning defined above

Kids Definition

doubtless

1 of 2 adverb

doubt·​less ˈdau̇t-ləs 

1

: certainly

2

: probably

doubtless

2 of 2 adjective

: free from doubt : certain

doubtlessly adverb