じわじわ (jiwajiwa)
The word describes something that moves and changes gradually, or creeps up on you. I like the nuance of じわじわ because there's a connotation of a pulsating or radiating energy, so there's a more dynamic image than something that simply moves slowly. じわじわ makes me think of a very uncomfortable mosquito bite that pulses with heat and itchiness.

Ray Masaki
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