Synonyms of functional in English:

functional


See US English definition of functional

See UK English definition of functional

See Spanish definition of funcional

adjective

1‘an ugly functional concrete building’

SYNONYMS
practical, useful, utilitarian, utility, workaday, serviceable
minimalist, plain, simple, basic
severe, spartan, ascetic, bare, modest, unadorned, undecorated, unornamented, unembellished, unostentatious, uncluttered, unfussy, without frills
impersonal, characterless, soulless, colourless, institutional, antiseptic, clinical
informal no frills
ANTONYMS

ornate, impractical

2‘the air vent needs clearing to keep it fully functional’

SYNONYMS
working, in working order, functioning, effective, usable, in service, in use
going, running, operative, operating, in operation, in commission, in action
informal up and running
ANTONYMS

out of order, malfunctioning