Common a- adjectives
These adjectives beginning with a- are only used in the predicate (after a linking verb such as be, feel, look or seem) and never before the noun:
- The baby is asleep. NOT The asleep baby....
- The man is alone. NOT The alone man....
1. Alert and aloof are used before the noun: an alert person, an aloof person
2. A few of the other a- adjectives are sometimes used before the noun if they are used with a modifier: the half-asleep man, the wide-awake child, the very ashamed student
So the basic rule is: Do not use these adjectives before a noun.
NOTE: Other adjectives beginning with a- such as abominable, assertive, attentive, etc. are used before and after the noun.