"slower" in the adjective sense

1. 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"

2. slow

at a slow tempo

"the band played a slow waltz"

3. dense, dim, dull, dumb, obtuse, 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"

4. slow

used of timepieces) indicating a time earlier than the correct time

"the clock is slow"

5. boring, deadening, dull, ho-hum, irksome, slow, tedious, tiresome, wearisome

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"

6. dull, slow, sluggish

of business) not active or brisk

"business is dull (or slow)"

"a sluggish market"

"slower" in the adverb sense

1. slower

more slowly

Source: WordNet® (An amazing lexical database of English)

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