ADJ
- great
- increased, increasing
- relative
- The relative frequency of this illness in the area is of concern to all doctors
- alarming
- Bullets bounced off the rock with alarming frequency
VERB + FREQUENCY
- decrease in, increase in
- Crime increases in frequency in less settled neighbourhoods
- decrease, increase, reduce
- The drug can reduce the frequency and severity of attacks
PREP
- with ~
- Accidents of this sort are happening with increasing frequency
ADJ
- high, low
- ultrasonic
- microwave, radio, television, vibration, wave
- signal