English Reference
Adjective

dehydrated

adj.
B2 Upper Intermediate US /dɪˈhaɪdɹeɪtəd/ UK /dˌiːhaɪdɹˈeɪtɪd/ de·hy·drat·ed

adj.feeling weak or sick because you have not drunk enough water. You might feel this way after a long run or a day in the sun.

adj.suffering from an excessive loss of water from the body. Often used predicatively after linking verbs such as 'become', 'feel', or 'look'.


SIMPLE

I felt very dehydrated after my long run in the sun.

CONTEXTUAL

The doctor warned that the patient was severely dehydrated and needed immediate fluids through an IV.

COMPLEX

Athletes performing in high-humidity environments must monitor their fluid intake closely, as it is possible to become dangerously dehydrated before the sensation of thirst even begins.

Usage

Often follows linking verbs like 'become' or 'feel'; can also be used attributively before a noun.

Pitfall
I am dehydrateI am dehydrated

Learners often use the base verb form instead of the participial adjective ending in -ed to describe their state.

I treated myself to a tear-heavy double feature and deboarded that plane feeling lighter, happier and more dehydrated than ever.

The Guardian· 31 Aug 2026
This entry
Level B2 · Upper Intermediate
Frequency Frequent
Updated