Synonyms of unceremonious in English:

unceremonious


See definition of unceremonious

adjective

1‘he waved them to an unceremonious halt’

SYNONYMS
abrupt, sudden, hasty, hurried, summary, perfunctory, undignified, rude, impolite, uncivil, discourteous, unmannerly, offhand, dismissive
informal off
ANTONYMS

polite

2‘an affable, unceremonious man’

SYNONYMS
informal, not formal, casual, relaxed
easy-going, easy, familiar, natural, unreserved, open, free, loose
informal laid-back, free and easy
ANTONYMS

formal