fossilized vs fossilised

fossilized and fossilised both are adjectives.

Word	Noun	Adjective	Verb	Adverb
fossilized	No	Yes	No	No
fossilised	No	Yes	No	No

As adjectives, fossilized and fossilised are synonyms defined as:

fossilized and fossilised: set in a rigidly conventional pattern of behavior, habits, or beliefs

Other synonyms of fossilized include ossified.

fossilized (adjective)	fossilised (adjective)
set in a rigidly conventional pattern of behavior, habits, or beliefs	set in a rigidly conventional pattern of behavior, habits, or beliefs