Irish:
cealgach: guileful/treacherous also beguiling/alluring.
fealltach: deceitful/treacherous
cleasach: playful; tricky/crafty
Scottish:
Another word for "insidious" is the word "treacherous"[or "sly",or "crafty"].
Morrie's disease "ALS" is insidious .
the investigators uncovered an insidious scheme to rob people of their money
You divide it like this: in-si-di-ous.
Scottish Gaelic is a 'coimhead.Irish Gaelic is cuma.
Insidious
No Gaelic word for Chalmers.
It is not a Gaelic word.
The word 'bassett' is not a Gaelic word, and therefore has no meaning in Gaelic.
In IRISH Gaelic the word is "vaidhtéaraí";in SCOTTISH Gaelic: ?
I've been to several specialists and no one can cure this insidious rash.
The word for 'prince' in Irish Gaelic is prionsa or flaith. The word in Scottish Gaelic is ...