unceremonious
adjective
[ ˌʌnsɛrɪˈməʊnɪəs ]
• having or showing a lack of courtesy; rough or abrupt.
• "he was known for his strong views and unceremonious manners"
Similar:
abrupt,
sudden,
hasty,
hurried,
summary,
perfunctory,
undignified,
rude,
impolite,
uncivil,
discourteous,
unmannerly,
offhand,
dismissive,
off,