From WordNet (r) 2.0 (August 2003) [wn]:
sneaking
adj : not openly expressed; "a sneaking suspicion" [syn:
{sneaking(a)}, unavowed]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Sneak \Sneak\ (sn[=e]k), v. i. [imp. & p. p. Sneaked
(sn[=e]kt); p. pr. & vb. n. Sneaking.] [OE. sniken, AS.
sn[imac]can to creep; akin to Dan. snige sig; cf. Icel.
sn[imac]kja to hanker after.]
1. To creep or steal (away or about) privately; to come or go
meanly, as a person afraid or ashamed to be seen; as, to
sneak away from company.
[1913 Webster]
You skulked behind the fence, and sneaked away.
--Dryden.
[1913 Webster]
2. To act in a stealthy and cowardly manner; to behave with
meanness and servility; to crouch.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Sneaking \Sneak"ing\, a.
Marked by cowardly concealment; deficient in openness and
courage; underhand; mean; crouching. -- Sneak"ing*ly, adv.
-- Sneak"ing*ness, n.
[1913 Webster]