DullNot interesting, bright, sharp, or lively; can also describe muted sound. is a very common English word with several meanings. It can describe something boring, not sharp, less bright, soft or muffledSoftened so it is hard to hear clearly. in sound, or a person or feeling that seems less livelyFull of energy, activity, or quickness. or less sharp.

Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-11-01. AI assessment; not a guarantee of accuracy.

Pronunciation

AI-generated pronunciation audio (OpenAI).

Accent: General American English

IPA: /dʌl/

Easy pronunciation: DULL (approximate spelling).

Stress: One syllable, with the vowel like in 'cup'.

Primary sense: adjective meaning boring or uninteresting.

Reviewed with OpenAI Decisions. Assessment: inaccurate — correction needed. Checked: 2026-11-01. AI assessment; not a guarantee of accuracy.

Dull Meaning

boring or uninteresting

Part of speech: adjective

Definition: lacking in interest or excitement; causing boredom

Example: The movie was dull, so we left early.

Synonyms for this meaning:

• boring — Direct, common substitute in everyday use.
• tedious — Works well when something is long and boring.
• tiresome — Often used for something that becomes boring because it is tedious or repetitive.
• wearisome — A stronger, more literary synonym for something that wears you out by being dull.
• ho-hum — Informal; fits something mildly boring or unimpressive.

Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-11-01. AI assessment; not a guarantee of accuracy.

Other Meanings of Dull

Meaning 2

not quick to understand

Part of speech: adjective

Definition: slow to learn or understand; lacking intellectual sharpness

Example: He was a dull student in science but strong in history.

Synonyms for this meaning:

• dense — Used for someone who is slow to understand.
• dim — Common informal word for not very quick to understand.
• obtuse — More formal; means slow to understand or not noticing things clearly.
• slow — Can mean mentally slow in this sense, though it is broader than dull.
• dumb — Can fit this sense in some contexts, but is often rude or imprecise.

Meaning 3

not sharp

Part of speech: adjective

Definition: not having a sharp edge or point

Example: This knife is dull and needs sharpening.

Synonyms for this meaning:

• blunt — A strong, direct synonym for a tool or edge that is not sharp.

Meaning 4

not bright or shiny

Part of speech: adjective

Definition: not bright, vivid, or shiny

Example: The metal had a dull finish after years of use.

Synonyms for this meaning:

• muted — Works well for colors, light, or finishes that are subdued.
• softened — Can work for light or sound, but is less direct than muted.
• leaden — Can describe a sky or light that looks heavy and gray.

Meaning 5

not loud or clear

Part of speech: adjective

Definition: softened, muffled, or less loud in sound

Example: We heard the dull sound of footsteps in the hallway.

Synonyms for this meaning:

• muffled — Very natural for sound that is partly blocked or softened.
• muted — Common for sound that is less loud or less clear.
• softened — Can describe sound that has been made less strong.

Meaning 6

not lively

Part of speech: adjective

Definition: less lively, less animated, or less vigorous

Example: After the long flight, everyone seemed dull and tired.

Synonyms for this meaning:

• slow — Can fit when someone is moving or reacting less energetically, but it is broader than dull.
• sluggish — Good for weak, slow, or unenergetic movement or activity.

Meaning 7

not sharp or intense

Part of speech: adjective

Definition: not keenly felt; causing a mild, lingering sensation rather than a sharp one

Example: She felt a dull ache in her shoulder.

Meaning 8

slow in business

Part of speech: adjective

Definition: of business or trade: not active or brisk

Example: Sales were dull after the holidays.

Synonyms for this meaning:

• slow — Common and natural for trade, sales, or business activity.
• sluggish — Suggests weak or inactive business conditions.

Reviewed with OpenAI Decisions. Assessment: inaccurate — correction needed. Checked: 2026-11-01. AI assessment; not a guarantee of accuracy.

Dull Synonyms

Similar Meaning

• boring
• tedious
• tiresome
• slow

slow to learn or understand

• dense
• dim
• obtuse
• dumb

not having a sharp edge or point

• blunt

not bright, vivid, or shiny

• muted
• leaden

softened or muffled in sound

• muffled
• muted

less lively or vigorous

• sluggish

not active or brisk in business

• slow
• sluggish

Reviewed with OpenAI Decisions. Assessment: uncertain — manual review needed. Checked: 2026-11-01. AI assessment; not a guarantee of accuracy.

Common Mistakes

• Confusing dull meaning 'boring' with dull meaning 'not sharp'.
• Using dull as if it always means 'stupid'; that is only one specific sense.
• Treating dull and dim as exact synonyms in every context; dim often refers to light or understanding, not boredom.
• Using dull for a pain that is weak or mild without noting that it means not sharp rather than absent.

Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-11-01. AI assessment; not a guarantee of accuracy.

Frequently Asked Questions

What is the most common meaning of dull?

The most common everyday meaning is 'boring' or 'uninteresting.'

Is dull a synonym of boring?

Yes. In the sense of something uninteresting or tiresome, dull and boring are strong synonyms.

What is a dull knife?

A dull knife is not sharp and does not cut well.

Can dull describe sound?

Yes. It can describe a sound that is muffled, soft, or not clear.

What does dull mean in business?

In business, dull means slow or not busy.

Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-11-01. AI assessment; not a guarantee of accuracy.