irrationalis

Latin

From in- (“un-”) +‎ ratiōnālis (“rational”).

(Classical Latin) IPA^(key): /ir.ra.ti.oːˈnaː.lis/, [ɪrːät̪ioːˈnäːlʲɪs̠]
(modern Italianate Ecclesiastical) IPA^(key): /ir.rat.t͡si.oˈna.lis/, [irːät̪ː͡s̪ioˈnäːlis]

irratiōnālis (neuter irratiōnāle); third-declension two-termination adjective

Third-declension two-termination adjective.

Case / Gender	Masc./Fem.	Neuter	Masc./Fem.	Neuter
Number	Singular		Plural
Nominative	irratiōnālis	irratiōnāle	irratiōnālēs	irratiōnālia
Genitive	irratiōnālis		irratiōnālium
Dative	irratiōnālī		irratiōnālibus
Accusative	irratiōnālem	irratiōnāle	irratiōnālēs irratiōnālīs	irratiōnālia
Ablative	irratiōnālī		irratiōnālibus
Vocative	irratiōnālis	irratiōnāle	irratiōnālēs	irratiōnālia

“irrationalis”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
irrationalis in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.