In French, a word is said to be variable when it declines. By that, we mean that this variable word will be transformed under  various circumstances (i.e. gender, number, conjugated forms, etc.)

In short, a variable word changes in form.

For example, a word like table (table) is variable.

• une table [table] (feminine - singular form)
• des tables [tables]  (feminine-plural form)

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Here are a few invariable words in French:

chic (cool) --> Elle est chic [she is cool]

orange (orange) --> des chemises orange [orange shirts]

vite (fast) --> ils courent vite [they run fast]

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