Jam-packed

adj, verb, slang

adj, verb, slang ·Moderate ·High school level

Definitions

Verb
  1. 1
    simple past and past participle of jam-pack form-of, participle, past
Adjective
  1. 1
    Packed or filled tightly. informal

    "Summer holidays: 'Staycationers' alight at London Paddington from a full train from the West Country. No matter what time of day, the trains are invariably jam-packed when they arrive at a London terminus."

Adjective
  1. 1
    extremely crowed or filled to capacity wordnet

Synonyms

All synonyms
alivebloatedbrimmingbristlingbulgingbursting

Antonyms

All antonyms
empty

Example

More examples

"The concert hall was so jam-packed there wasn't room to breathe."

Etymology

From jam + packed.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.