1.  crusty(s = adj.all) crusted, crustlike, encrusted - having a hardened crust as a covering;
Derived form noun crust₂

2.  crusty(s = adj.all) curmudgeonly, gruff, ill-humored, ill-humoured - brusque and surly and forbidding; "crusty remarks"; "a crusty old man"; "his curmudgeonly temper"; "gruff manner"; "a gruff reply"
Derived form noun crust₃

1.  Having the nature of crust; pertaining to a hard covering; as, a crusty coat; a crusty surface or substance. [1913 Webster]

2.  Having a hard exterior, or a short, rough manner, though kind at heart; snappish; peevish; surly. [1913 Webster]
"Thou crusty batch of nature, what's the news?" [1913 Webster]

crusty, adj. (crustier, crustiest)
1 having a crisp crust (a crusty loaf).
2 irritable, curt.
3 hard, crustlike.

Derivative:
crustily adv. crustiness n.

N  sullenness, morosity, spleen, churlishness, irascibility, moodiness, perversity, obstinacy, torvity, spinosity, crabbedness, ill temper, bad temper, ill humor, bad humor, sulks, dudgeon, mumps, dumps, doldrums, fit of the sulks, bouderie, black looks, scowl, grouch, huff, sullen, sulky, ill-tempered, ill-humored, ill-affected, ill- disposed, grouty, in an ill temper, in a bad temper, in a shocking temper, in an ill humor, in a bad humor, in a shocking humor, out of temper, out of humor, knaggy, torvous, crusty, crabbed, sour, sour as a crab, surly, moody, spleenish, spleenly, splenetic, cankered, cross, crossgrained, perverse, wayward, humorsome, restiff, restive, cantankerous, intractable, exceptious, sinistrous, deaf to reason, unaccommodating, rusty, froward, cussed, dogged, grumpy, glum, grim, grum, morose, frumpish, in the sulks, out of sorts, scowling, glowering, growling, grouchy, peevish.