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Definition 2025

caith ‎(present analytic caitheann, future analytic caithfidh, verbal noun caitheamh, past participle caite)

to wear
to consume
1. to smoke (tobacco)
to spend
to throw
(in future and conditional) must, have to
Caithfidh mé imeacht.‎ ― I have to go.

First Conjugation (A)

		singular			plural			relative	autonomous
		first	second	third	first	second	third	relative	autonomous
indicative	present	caithim	caitheann tú; caithir^†	caitheann sé, sí	caithimid	caitheann sibh	caitheann siad; caithid^†	a chaitheann; a chaitheas / a gcaitheann; a gcaitheas	caitear
	past	chaith mé; chaitheas	chaith tú; chaithis	chaith sé, sí	chaitheamar; chaith muid	chaith sibh; chaitheabhair	chaith siad; chaitheadar	a chaith / ar chaith*	caitheadh
	past habitual	chaithinn	chaiteá	chaitheadh sé, sí	chaithimis; chaitheadh muid	chaitheadh sibh	chaithidís; chaitheadh siad	a chaitheadh / ar chaitheadh*	chaití
	future	caithfidh mé; caithfead	caithfidh tú; caithfir^†	caithfidh sé, sí	caithfimid; caithfidh muid	caithfidh sibh	caithfidh siad; caithfid^†	a chaithfidh; a chaithfeas / a gcaithfidh; a gcaithfeas	caithfear
conditional		chaithfinn	chaithfeá	chaithfeadh sé, sí	chaithfimis; chaithfeadh muid	chaithfeadh sibh	chaithfidís; chaithfeadh siad	a chaithfeadh / ar chaithfeadh*	chaithfí
subjunctive	present	go gcaithe mé; go gcaithead^†	go gcaithe tú; go gcaithir^†	go gcaithe sé, sí	go gcaithimid; go gcaithe muid	go gcaithe sibh	go gcaithe siad; go gcaithid^†	—	go gcaitear
subjunctive	past	dá gcaithinn	dá gcaiteá	dá gcaitheadh sé, sí	dá gcaithimis; dá gcaitheadh muid	dá gcaitheadh sibh	dá gcaithidís; dá gcaitheadh siad	—	dá gcaití
imperative		caithim	caith	caitheadh sé, sí	caithimis	caithigí; caithidh^†	caithidís	—	caitear
verbal noun		caitheamh
past participle		caite

* Indirect relative
† Dialect form

Irish mutation
Radical	Lenition	Eclipsis
caith	chaith	gcaith
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.

From Old Irish caithid.

caith ‎(past chaith, future caithidh, verbal noun caitheamh, past participle caithte)