adverb, adverb taking the 'to' particle
weeping softly; sobbing quietly
Describes crying in a subdued, continuous manner, often with sniffles. Commonly used with 泣く.
See also: しくしく泣く
彼女はしくしく泣いていた。
She was weeping softly.
adverb, adverb taking the 'to' particle, noun or participle which takes 'suru'
with a dull persistent pain; griping pain
Describes a continuous, dull, aching pain, often in the stomach or abdomen. Can be used with 痛む or as a する-verb.
お腹がしくしく痛む。
My stomach has a dull, persistent ache.