There are 2 definitions of -itious in English:

-itious1

Pronunciation: /ˈɪʃəs/

suffix

Forming adjectives corresponding to nouns ending in -ition (such as ambitious corresponding to ambition).

Origin

from Latin -itiosus.

Definition of -itious in:

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Word of the day internecine
Pronunciation: ˌɪntəˈniːsʌɪn
adjective
destructive to both sides in a conflict

There are 2 definitions of -itious in English:

-itious2

Pronunciation: /ˈɪʃəs/

suffix

(Forming adjectives) related to; having the nature of: fictitious suppositious

Origin

from late Latin -itius, alteration of Latin -icius.

Definition of -itious in:

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Word of the day internecine
Pronunciation: ˌɪntəˈniːsʌɪn
adjective
destructive to both sides in a conflict