lucky day but not in the morning; day on which judgment and haste are avoided (judgement)
being a poor loser; unwillingness to admit defeat; sour grapes
being unworthy of one's rank; being outranked
losing by being overmatched; being defeated by a stronger opponent; losing by misusing one's powers; defeat as a result of trying too hard
losers (those who have 'failed' socially, economically, etc.)
to have more losses than wins