The number was varied by the frequency or infrequency of the severer headaches.
Complains of the infrequency and delay of despatches from Mr Adams.
The infrequency of their appearance marks the lateness and backwardness of our spring.
Production norms under the system have been low because of technological advances and the infrequency of adjustment of norms.
It's truth's infrequency which makes her so charming and refreshing.
To our friend this infrequency seemed to be, upon this occasion, a misfortune.
I have before mentioned the irregularity and infrequency of the mails.
The infrequency of her walks made them the chief events of her life.
Indeed, it happens with an infrequency which may be regarded as remarkable.
Poor condition, overwork, and undersleep, led to infrequency.