mentiroso
/mentiˈɾoso/ · A2 · adj
liar
🤥 mentira (lie) + -oso (full of) = full of lies
Built from mentira, a lie, plus the suffix -oso, which matches English -ous and means full of. Same root as mentir, to lie, and the mend- in English mendacious. So mentiroso is literally lie-ous: a liar, or lying.