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Definitions

deep down

ADJECTIVE
deep-seated
Synonyms
STRONGEST
built-in chronic deep-rooted inbred inherent longstanding
WEAK
confirmed deep-down deeply felt dyed-in-the-wool established fixed habitual inborn lodged in one's brain longtime subconscious
Antonyms
STRONGEST
added temporary
ADJECTIVE
dyed-in-the-wool
Synonyms
WEAK
absolute complete confirmed congenital deep-down deep-dyed deep-rooted deep-seated deeply ingrained die-hard entrenched fixed full-fledged genuine hardened infixed ingrained instilled long-standing out and out thorough thoroughgoing through-and-through to the core true unchangeable uncompromising utter well-established
ADVERB
at heart
Synonyms
WEAK
at bottom basically fundamentally in essence in spite of appearance inside
ADVERB
internally
Synonyms
STRONGEST
inside
STRONG
within
WEAK
inwardly mentally privately
ADVERB
inwardly
Synonyms
STRONGEST
internally within
STRONG
at heart privately secretly
WEAK
mentally
Antonyms
WEAK
outwardly

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

“Beijing knows deep down that this isn’t about China at all,” said Jeremy Chan of the political-risk consulting firm Eurasia Group.

From The Wall Street Journal • Mar. 18, 2026

"On the surface, you try and put a brave face on - but deep down inside you know you're not right," Ross said.

From BBC • Mar. 5, 2026

“We just got to dig deep down and everyone has got to bring effort every time, all the time,” Hayes said, “and that’s all we have to care about is defense.”

From Los Angeles Times • Dec. 31, 2025

Amanda was troubled by what she saw, but she didn’t believe these were hateful boys, deep down.

From Slate • Dec. 5, 2025

Because deep down I do know she’s right.

From "Amari and the Night Brothers" by B.B. Alston

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.