1 Formal and forbidding
2 Norse writing
3 Allude
4 Recent (prefix)
5 Always
6 Peruvian prince
7 Vessel
8 Secure
9 Source
10 Beliefs
15 Hill
17 Unit
20 Elastic fluid
23 Fabulist
25 Water of forgetfulness
27 Oxygen and nitrogen
28 Skillful
29 Empyrean
31 Unctuous liquid
34 Assault
35 Observe
37 Made of curled hair
39 Roofed street
40 Lavatory
42 Large bird
43 Female bird
45 Soon
47 Egyptian goddess
48 Where marriages are unmade
50 Costumes
52 Australian bird
54 Spread loosely