The Collaborative International Dictionary of English v.0.48:

Unshrinking \Unshrinking\
   See shrinking.

WordNet (r) 3.0 (2006):

unshrinking
    adj 1: not shrinking from danger [syn: unblinking,
           unflinching, unintimidated, unshrinking]

Moby Thesaurus II by Grady Ward, 1.0:

73 Moby Thesaurus words for "unshrinking":
   accessible, approachable, calm, candid, communicative, conversable,
   coolheaded, demonstrative, effusive, expansive, extroverted, frank,
   free, free-speaking, free-spoken, free-tongued, gossipy,
   inexcitable, nerveless, newsy, nothing loath, open, outgoing,
   outspoken, relaxed, rock-steady, self-revealing, self-revelatory,
   sociable, steady, steady-handed, steady-nerved, steel-nerved,
   stick-at-nothing, strong-nerved, talkative, unabashed, unappalled,
   unaverse, unawed, unblenching, unblinking, unconstrained, uncowed,
   uncringing, undaunted, undismayed, unfaltering, unflinching,
   ungrudging, ungrumbling, unhampered, unhesitant, unhesitating,
   unintimidated, unloath, unnervous, unquivering, unreluctant,
   unrepressed, unreserved, unrestrained, unrestricted, unreticent,
   unsecretive, unshaken, unshaky, unsilent, unstrained, unsuppressed,
   untremulous, unwavering, without a tremor