Hastily means in too much of a hurry, without proper care. Hastily written, hastily arranged, retreat hastily.
The criticism is built in: doing something hastily says the speed cost something, which is why hastily and quickly are not interchangeable. It usually attaches to arrangements and to writing. Note haste, and the proverb that more haste means less speed.
1adverbhastilyIn too much of a hurry, without proper care.
“The report was written hastily and was full of careless mistakes.”
hastily is a manner of hurrying.
Also accepted in games: hurriedly
Frankish
*haifst — violence
Old French
hastif
Middle English
hasty
English
hasty
English, today
hastily
From hasty + -ly. hasty comes from Middle English hasty, of unknown origin. Likely a new formation in Middle English equivalent to haste + -y, found as in other Germanic languages (Old Frisian hâstich, Middle Dutch haestich (> Dutch haastig (“hasty”)), Middle Low German hastich (“hasty”), German hastig, Danish hastig, Swedish hastig (“hasty”)); otherwise possibly representing an assimilation to the foregoing of Middle English hastive, hastif (> English hastive), from Old French hastif (Modern French hâtif), from Frankish haifst (“violence”), ultimately of the same gem - origin.
Etymology from Wiktionary, CC BY-SA