rapid /ˈræpɪd/ (adjective) happening quickly or in a short period of time Example: The patient made a rapid recovery.
gradual /ˈɡrædʒuəl/ (adjective) happening slowly over a long period; not sudden Example: Recovery from the disease is very gradual.
fast /fæst/ (adjective) moving or able to move quickly Example: The car runs fast
quick /kwɪk/ (adjective) done with speed; taking or lasting a short time Example: She gave him a quick glance.
slow /sləʊ/ (adjective) not moving, acting or done quickly; taking a long time; not fast Example: Collecting data is a painfully slow process.
prompt /prɑːmpt/ (verb) to make somebody decide to do something; to cause something to happen Example: The thought of her daughter's wedding day prompted her to lose some weight.
speed /spiːd/ (noun) the rate at which somebody/something moves or travels Example: There are speed restrictions on this road.
speedy /ˈspiːdi/ (adjective) happening or done quickly or without delay Example: We need to make a speedy decision.
swift /swɪft/ (adjective) happening or done quickly and immediately; doing something quickly Example:
brisk /brɪsk/ (adjective) quick; busy Example: a brisk walk
hasty /ˈheɪsti/ (adjective) said, made or done very quickly, especially when this has bad results Example: