English Reference
adjective · noun

thick

adj. · n.
US /ˈθɪk/ UK /θˈɪk/ thick UK spelling thicks

  1. 01 A2 Elementary

    adj.having a large distance between two sides; not thin.

    adj.having a relatively great distance between opposite sides or surfaces.

    Simple

    The walls of the old castle are very thick to keep the heat inside.

    In context

    The architect specified thick glass panels for the storefront to ensure both thermal insulation and security against potential break-ins.

  2. 02 B1 Intermediate

    adj.describing a liquid that does not flow easily.

    adj.having a semi-solid or viscous consistency; resistant to flow.

    Simple

    The soup was so thick that the spoon could almost stand up in it.

    In context

    The mechanic drained the thick, blackened oil from the engine, noting that the vehicle had clearly missed several scheduled services.

  3. 03 B1 Intermediate

    adj.having many things or people close together.

    adj.growing or appearing in close proximity; densely packed.

    Simple

    We had a hard time walking through the thick forest.

    In context

    A thick fog descended over the valley, reducing visibility to less than ten metres and forcing the airport to cancel all morning flights.

  4. 04 B2 Upper Intermediate Informal

    adj.not quick to learn or understand things.

    adj.slow to learn or understand; lacking intelligence.

    Simple

    I felt a bit thick when I couldn't solve the simple puzzle.

    In context

    He was tired of being treated as if he were thick just because he spoke with a heavy regional accent.

  5. 05 C1 Advanced Informal

    adj.being very close or friendly with someone.

    adj.intimately associated or very friendly; often used in the idiom 'thick as thieves'.

    Simple

    Those two have been thick as thieves since they started primary school.

    In context

    The two political rivals were suddenly thick as thieves, leading many to suspect a secret deal had been struck behind closed doors.

  6. 06 B2 Upper Intermediate

    n.the middle of a busy or dangerous situation.

    n.the most active, intense, or crowded part of a situation or place.

    Simple

    The reporter was right in the thick of the action during the protest.

    In context

    In the thick of the negotiations, the lead diplomat remained remarkably calm despite the mounting pressure from both sides.

Usage thick layer · thick smoke


From Middle English thikke, from Old English þicce (“thick, dense”), from Proto-West Germanic þikkwī, from Proto-Germanic þekuz (“thick”), from Proto-Indo-European *tégus (“thick”). Cognates Cognate with North Frisian sjok, tjok, tjuk, tschok (“thick”), Saterland Frisian tjuk (“thick”), West Frisian dik, tuuk (“thick”), Central Franconian deck (“thick”), Cimbrian dikh, dikhe (“thick”), Dutch dik (“thick”), German dick (“thick”), Luxembourgish déck (“thick”), Yiddish דיק (dik, “thick”), Danish tyk (“thick”), Elfdalian tiokk (“thick”), Faroese tjúkkur (“thick”), Icelandic þykkur (“thick”), Norwegian Bokmål and Norwegian Nynorsk tjukk, tykk (“thick”), Scanian tjykker (“thick”), Swedish tjock (“thick”); also Cornish and Welsh tew (“thick”), Irish tiubh, tiugh (“thick”), Manx çhiu (“thick”), Scottish Gaelic tiugh (“thick”).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin ine-pro *tégus
Level A2 · Elementary
Frequency Common
Updated