【Amiss】 and 【Astray】 share the meaning wrong or otherwise than intended.
【Amiss】 implies failure (as of an arrow) to reach the mark aimed at and frequently suggests a shortcoming or defect (as by failure to reach a standard, an expectation, a definite conclusion, or the point of being useful).
his shafts of wit went 【amiss】
she seemed unconcerned, as though nothing had happened 【amiss】
no information came 【amiss】 to him
Sometimes 【amiss】 suggests a divergence from the normal or usual order.
whether his general health had been previously at all 【amiss】 —Dickens
"What's 【amiss】 in the Square?" . . . "Just now I saw a man running along Wedge wood Street" —Bennett
【Astray】 emphasizes wandering from a predetermined path or the right way or course; it usually suggests moral or intellectual errancy.
lest in temptation's path ye gang 【astray】 —Burns
in many an hour when judgment goes 【astray】 —Wordsworth
