épaissir

French

Etymology

From épais +‎ -ir.

Pronunciation

• IPA^(key): /e.pɛ.siʁ/, /e.pe.siʁ/

• Audio

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Verb

épaissir

1. to thicken, get/make thicker

Conjugation

This is a regular verb of the second conjugation, like finir, choisir, and most other verbs with infinitives ending in -ir. One salient feature of this conjugation is the repeated appearance of the infix -iss-.

Conjugation of épaissir (see also Appendix:French verbs)

infinitive	simple	épaissir
	compound	avoir + past participle
present participle or gerund1	simple	épaississant /e.pɛ.si.sɑ̃/ or /e.pe.si.sɑ̃/
	compound	ayant + past participle
past participle		épaissi /e.pɛ.si/ or /e.pe.si/
		singular			plural
		first	second	third	first	second	third
indicative		je (j’)	tu	il, elle, on	nous	vous	ils, elles
(simple tenses)	present	épaissis /e.pɛ.si/ or /e.pe.si/	épaissis /e.pɛ.si/ or /e.pe.si/	épaissit /e.pɛ.si/ or /e.pe.si/	épaississons /e.pɛ.si.sɔ̃/ or /e.pe.si.sɔ̃/	épaississez /e.pɛ.si.se/ or /e.pe.si.se/	épaississent /e.pɛ.sis/ or /e.pe.sis/
	imperfect	épaississais /e.pɛ.si.sɛ/ or /e.pe.si.sɛ/	épaississais /e.pɛ.si.sɛ/ or /e.pe.si.sɛ/	épaississait /e.pɛ.si.sɛ/ or /e.pe.si.sɛ/	épaississions /e.pɛ.si.sjɔ̃/ or /e.pe.si.sjɔ̃/	épaississiez /e.pɛ.si.sje/ or /e.pe.si.sje/	épaississaient /e.pɛ.si.sɛ/ or /e.pe.si.sɛ/
	past historic2	épaissis /e.pɛ.si/ or /e.pe.si/	épaissis /e.pɛ.si/ or /e.pe.si/	épaissit /e.pɛ.si/ or /e.pe.si/	épaissîmes /e.pɛ.sim/ or /e.pe.sim/	épaissîtes /e.pɛ.sit/ or /e.pe.sit/	épaissirent /e.pɛ.siʁ/ or /e.pe.siʁ/
	future	épaissirai /e.pɛ.si.ʁe/ or /e.pe.si.ʁe/	épaissiras /e.pɛ.si.ʁa/ or /e.pe.si.ʁa/	épaissira /e.pɛ.si.ʁa/ or /e.pe.si.ʁa/	épaissirons /e.pɛ.si.ʁɔ̃/ or /e.pe.si.ʁɔ̃/	épaissirez /e.pɛ.si.ʁe/ or /e.pe.si.ʁe/	épaissiront /e.pɛ.si.ʁɔ̃/ or /e.pe.si.ʁɔ̃/
	conditional	épaissirais /e.pɛ.si.ʁɛ/ or /e.pe.si.ʁɛ/	épaissirais /e.pɛ.si.ʁɛ/ or /e.pe.si.ʁɛ/	épaissirait /e.pɛ.si.ʁɛ/ or /e.pe.si.ʁɛ/	épaissirions /e.pɛ.si.ʁjɔ̃/ or /e.pe.si.ʁjɔ̃/	épaissiriez /e.pɛ.si.ʁje/ or /e.pe.si.ʁje/	épaissiraient /e.pɛ.si.ʁɛ/ or /e.pe.si.ʁɛ/
(compound tenses)	present perfect	present indicative of avoir + past participle
	pluperfect	imperfect indicative of avoir + past participle
	past anterior2	past historic of avoir + past participle
	future perfect	future of avoir + past participle
	conditional perfect	conditional of avoir + past participle
subjunctive		que je (j’)	que tu	qu’il, qu’elle	que nous	que vous	qu’ils, qu’elles
(simple tenses)	present	épaississe /e.pɛ.sis/ or /e.pe.sis/	épaississes /e.pɛ.sis/ or /e.pe.sis/	épaississe /e.pɛ.sis/ or /e.pe.sis/	épaississions /e.pɛ.si.sjɔ̃/ or /e.pe.si.sjɔ̃/	épaississiez /e.pɛ.si.sje/ or /e.pe.si.sje/	épaississent /e.pɛ.sis/ or /e.pe.sis/
	imperfect2	épaississe /e.pɛ.sis/ or /e.pe.sis/	épaississes /e.pɛ.sis/ or /e.pe.sis/	épaissît /e.pɛ.si/ or /e.pe.si/	épaississions /e.pɛ.si.sjɔ̃/ or /e.pe.si.sjɔ̃/	épaississiez /e.pɛ.si.sje/ or /e.pe.si.sje/	épaississent /e.pɛ.sis/ or /e.pe.sis/
(compound tenses)	past	present subjunctive of avoir + past participle
	pluperfect2	imperfect subjunctive of avoir + past participle
imperative		–	tu	–	nous	vous	–
simple		—	épaissis /e.pɛ.si/ or /e.pe.si/	—	épaississons /e.pɛ.si.sɔ̃/ or /e.pe.si.sɔ̃/	épaississez /e.pɛ.si.se/ or /e.pe.si.se/	—
compound		—	simple imperative of avoir + past participle	—	simple imperative of avoir + past participle	simple imperative of avoir + past participle	—
1 The French gerund is usable only with the preposition en.
2 In less formal writing or speech, these tenses may be found to have been replaced in the following way: past historic → present perfect past anterior → pluperfect imperfect subjunctive → present subjunctive pluperfect subjunctive → past subjunctive (Christopher Kendris [1995], Master the Basics: French, pp. 77, 78, 79, 81).

Derived terms

• épaississement

Further reading

• “épaissir”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.