slow (adj.)

Old English slaw "inactive, sluggish, torpid, lazy," also "not clever," from Proto-Germanic *slæwaz (source also of Old Saxon sleu "blunt, dull," Middle Dutch slee, Dutch sleeuw "sour, tart, blunt," Old High German sleo "blunt, dull," Old Norse sljor, Danish sløv, Swedish slö "blunt, dull"). Meaning "taking a long time" is attested from early 13c. Meaning "dull, tedious" is from 1841. As an adverb c. 1500. The slows "imaginary disease to account for lethargy" is from 1843.

slow (v.)

1550s, "make slower;" 1590s, "go slower," from slow (adj.). Related: Slowed; slowing. Old English had slawian (intransitive) "to be or become slow, be sluggish," but the modern use appears to be a 16c. re-formation.

Definitions of slow
slow (adj.)
not moving quickly; taking a comparatively long time;
he was slow in reacting to the news
her steps were slow
the slow lane of traffic
slow but steady growth
a slow walker
slow (adj.)
at a slow tempo;
the band played a slow waltz
slow (adj.)
slow to learn or understand; lacking intellectual acuity; "although dull at classical learning, at mathematics he was uncommonly quick"- Thackeray;
worked with the slow students
Synonyms: dense / dim / dull / dumb / obtuse
slow (adj.)
(used of timepieces) indicating a time earlier than the correct time;
the clock is slow
slow (adj.)
so lacking in interest as to cause mental weariness; "what an irksome task the writing of long letters is"- Edmund Burke; "the tiresome chirping of a cricket"- Mark Twain;
Synonyms: boring / deadening / dull / ho-hum / irksome / tedious / tiresome / wearisome
slow (adj.)
(of business) not active or brisk;
business is dull (or slow)
Synonyms: dull / sluggish
slow (v.)
lose velocity; move more slowly;
Synonyms: decelerate / slow down / slow up / retard
slow (v.)
become slow or slower;
Production slowed
Synonyms: slow down / slow up / slack / slacken
slow (v.)
cause to proceed more slowly;
The illness slowed him down
Synonyms: slow down / slow up
slow (adv.)
without speed (`slow' is sometimes used informally for `slowly');
please go slow so I can see the sights
Synonyms: slowly / easy / tardily
slow (adv.)
of timepieces;
the clock is almost an hour slow
Synonyms: behind