Adverbs in -ment

Most French adverbs of manner end in -ment (like English -ly). You build them from the adjective:

• Feminine form + -ment: lent → lente → lentement, heureux → heureuse → heureusement, doux → douce → doucement.
• Masculine adjective ending in a vowel + -ment: vrai → vraiment, poli → poliment, absolu → absolument.
• -ant → -amment: courant → couramment, constant → constamment.
• -ent → -emment: prudent → prudemment, récent → récemment (but lent → lentement). Both endings are pronounced the same, -amment.
• Learn these by heart: gentil → gentiment, énorme → énormément, précis → précisément, bref → brièvement, profond → profondément.

An adverb never agrees: it has only one form. It usually comes right after the verb.