-ax

Perhaps extracted from relax.

• IPA^(key): /aks/

-ax (adjective-forming suffix, invariable)

1. (slang) Adjective-forming suffix.

   ‎furieux + ‎-ax → ‎furax

   ‎tendu + ‎-ax → ‎tendax

Adjectival form of a Proto-Indo-European k-stem, from Proto-Italic *-āks, from words of the form Proto-Indo-European *-eh₂-k-s. Compare Ancient Greek -αξ (-ax), Proto-Slavic *-akъ.

• (Classical Latin) IPA^(key): [aːks]
• (modern Italianate Ecclesiastical) IPA^(key): [aks]

-āx (genitive -ācis); third-declension one-termination suffix

1. used to form adjectives expressing a tendency or inclination to the action of the root verb; -ish, -y

   audeō (“to dare”) > audāx (“bold”)

   edō (“to eat”) > edāx (“gluttonous, voracious”)

   loquor (“to talk”) > loquāx (“talkative”)

   pugnō (“to fight”) > pugnāx (“combative, fond of fighting”)

Third-declension one-termination adjective.

From common dialectal Arabic -aʿš, -āš, from عَشَرة (ʕašara, “ten”), whence Maltese għaxra. There is evidence that the underlying għ had already been vocalised in this ending before the same happened as a general development in Maltese (hence also the lack of it in the spelling). We find the same vocalisation in some modern Arabic dialects; compare Egyptian Arabic حداشر (ḥidāšar, “eleven”).

• IPA^(key): /aːʃ/
• Sometimes shortened to /aʃ/, but still stressed.

-ax

1. Used to form the pronominal forms of the cardinal numbers from 11 to 19; -teen.

   ‎tnejn (“two”) + ‎-ax → ‎tnax (“twelve”)

   ‎sebat (“seven”, attributive) + ‎-ax → ‎sbatax (“seventeen”)

• With numbers from 13 to 19, the form is derived from the long attributive form in -t of the underlying simple number. Slight vocalic changes may occur (as the loss of the e in sbatax above).
• Attributively, that is before a noun, numbers in -ax add the additional ending -il. See that lemma.