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.

But I had known deep down something wasn't right with me since the age of 10, when my periods and hormone cycle activated.

From BBC • Jun. 1, 2026

The next revolution in physics may not take us faster than light — but it could reveal that time, deep down in the microscopic world and in a bouncing universe, flows both ways.

From Science Daily • May 22, 2026

"It was very late at night and I was very deep down the mountain," she said.

From BBC • May 20, 2026

Maybe it was the underbelly of all of the bravado and power-seeking—some desire to counter all the validation with the humiliation of knowing that, deep down, he’s just a revolting little worm.

From Slate • Apr. 15, 2026

Because there was a breaking deep down inside me.

From "A Rover's Story" by Jasmine Warga

deep down

Example Sentences

Related Words