in Romanian language the adjective takes different forms according to the gender of the noun.
"limba" is female, so we say "limba romana" or "limba romaneasca" - the adjective singular ends in "a"
"cantec" is male, so we say "cantec roman" or "cantec romanesc" - the adjetive singular ends in a consonant
for plural:
"limbi romane"
"cantece romanesti"