1.
move slowly and carefully, esp. in order to avoid being heard or noticed.
"he crept downstairs, hardly making any noise"

synonyms: tiptoe, steal, sneak, slip, slink, sidle, pad, edge, inch; More

2.
(of an unwanted and negative characteristic or fact) occur or develop gradually and almost imperceptibly.
"errors crept into his game"

1.
informal
a detestable person.2.
slow movement, esp. at a steady but almost imperceptible pace.
"an attempt to prevent this slow creep of costs"