decrease,
diminish,
lessen,
fall decrease in size, extent, or range; "The amount of homework decreased towards the end of the semester"; "The cabin pressure fell dramatically"; "her weight fell to under a hundred pounds"; "his voice fell to a whisper"
detain,
delay,
hold up cause to be slowed down or delayed; "Traffic was delayed by the bad weather"; "she delayed the work that she didn't want to perform"
Adjective
slow -
not moving quickly; taking a comparatively long time; "a slow walker"; "the slow lane of traffic"; "her steps were slow"; "he was slow in reacting to the news"; "slow but steady growth"
fast (of a photographic lens or emulsion) causing a shortening of exposure time; "a fast lens"
gradual proceeding in small stages; "a gradual increase in prices"
unhurried relaxed and leisurely; without hurry or haste; "people strolling about in an unhurried way"; "an unhurried walk"; "spoke in a calm and unhurried voice"
larghetto (of tempo) less slow and broad than largo
larghissimo (of tempo) as slow and broad as possible
slow -
(used of timepieces) indicating a time earlier than the correct time; "the clock is slow"
Slow -
slow to learn or understand; lacking intellectual acuity; "so dense he never understands anything I say to him"; "never met anyone quite so dim"; "although dull at classical learning, at mathematics he was uncommonly quick"- Thackeray; "dumb officials make some really dumb decisions"; "he was either normally stupid or being deliberately obtuse"; "worked with the slow students"
stupid lacking or marked by lack of intellectual acuity
Slow -
so lacking in interest as to cause mental weariness; "a boring evening with uninteresting people"; "the deadening effect of some routine tasks"; "a dull play"; "his competent but dull performance"; "a ho-hum speaker who couldn't capture their attention"; "what an irksome task the writing of long letters is"- Edmund Burke; "tedious days on the train"; "the tiresome chirping of a cricket"- Mark Twain; "other people's dreams are dreadfully wearisome"