WordNet sense 1 (an air mass of lower pressure; often brings precipitation):

depression

WordNet sense 2 (British political cartoonist (born in New Zealand) who created the character Colonel Blimp (1891-1963)):

David Low, Sir David Alexander Cecil Low, Sir David Low

WordNet sense 3 (the lowest forward gear ratio in the gear box of a motor vehicle; used to start a car moving):

first, first gear, low gear

WordNet sense 4 (low or inferior in station or quality):

lowly, modest, small

WordNet sense 5 (of or characteristic of low rank or importance):

inferior

WordNet sense 6 (no longer sufficient):

depleted

WordNet sense 7 (of a quantity not able to fulfill a need or requirement):

deficient, insufficient

WordNet sense 8 ((used of persons and their behavior) not refined; uncouth):

unrefined

WordNet sense 9 (subdued or brought low in condition or status):

broken, humiliated, crushed, humbled

WordNet sense 10 (marked by meekness or modesty; not arrogant or prideful):

humble

WordNet sense 11 (very low in volume):

low-toned

WordNet sense 12 ((of sound) relatively low in volume):

soft

WordNet sense 13 (having or denoting a low vocal or instrumental range):

bass, deep, bass

WordNet sense 14 (used of sounds and voices; low in pitch or frequency):

low-pitched

WordNet sense 15 (well below normal (especially in price)):

reduced

WordNet sense 16 (lower than previously):

depressed, down

WordNet sense 17 (lowered in value):

degraded

WordNet sense 18 (located below or beneath something else):

under

WordNet sense 19 (make a low noise, characteristic of bovines):

moo

WordNet sense 20 (of the most contemptible kind):

abject, miserable, scummy, scurvy, low-down

WordNet sense 21 (deserving of contempt or scorn):

contemptible

WordNet sense 22 (low in spirits):

blue, dispirited, downcast, downhearted, low-spirited, down in the mouth

WordNet sense 23 (affected or marked by low spirits):

dejected

WordNet sense 24 (of the transmission gear causing forward movement in a motor vehicle):

forward