Lucky
The word 'unlucky' is an adjective form of the noun luck.
The root of unfortunate would be fortune. un is the prefix and ate is the suffix.
"Unlucky" has two morphemes: "un-" (a prefix meaning not) and "lucky" (the root word).
The root is the noun "luck" which becomes an adjective by adding the suffix -y and a negative by adding the prefix un- (not).
The root is the noun "luck" which becomes an adjective by adding the suffix -y and a negative by adding the prefix un- (not).
"lucky" and "luckless" have the root "luck" and then a suffix. I can't think of any examples with a prefix.
There is no such thing as an unlucky day. Although, there are unlucky things such as the devil.
unlucky
unlucky
Not lucky; not successful; unfortunate; ill-fated; unhappy; as, an unlucky man; an unlucky adventure; an unlucky throw of dice; an unlucky game., Bringing bad luck; ill-omened; inauspicious., Mischievous; as, an unlucky wag.
Friday the 13th's Are unlucky!
"Unlucky" in Latin is infelix.