once in a while

adv 0.800

every once in a while

adv 0.757

rarely

adv 0.700

occasionally

adv 0.685

every so often

adv 0.675

infrequently

adv 0.660

seldom

adv 0.652

unfrequently

adv 0.643

now and then

adv 0.611

sometimes

adv 0.597

uncommonly

adv 0.587

never in a million years

adv 0.573

sporadically

adv 0.561

sometime

adv 0.557

once

adv 0.551

oftimes

adv 0.548

unlikely

adv 0.546

exceptionally

adv 0.543

never

adv 0.541

periodically

adv 0.536

never ever

adv 0.530

unusually

adv 0.530

intermittently

adv 0.526

someday

adv 0.523

bimonthly

adv 0.520

twice

adv 0.515

one day

adv 0.515

monthly

adv 0.514

perchance

adv 0.511

every time

adv 0.510

more often than not

adv 0.508

time after time

adv 0.508

biannually

adv 0.507

momentarily

adv 0.502

off and on

adv 0.501