Turbid

Adjective

Definition: Cloudy or opaque, typically due to the presence of suspended particles or impurities in a liquid.

Synonyms: Cloudy, Murky, Muddy

Antonyms: Clear, Transparent

Examples:

The river became turbid after heavy rainfall, making it difficult to see the bottom.
The water in the fish tank turned turbid when the filter stopped working.

Mnemonics:

Think of "turbid" as "trouble in the liquid," indicating that the liquid is clouded or murky.
"Turbid" sounds similar to "turbulence," which can be associated with cloudy or disturbed conditions.

Etymology:

Origin:

Late Middle English from Latin 'turbidus', from 'turbare' meaning 'to disturb'.

Historical Usage:

The word has been used in the English language since the late Middle English period and has maintained its meaning of cloudiness or muddiness throughout its history.