(n)impression, feeling, belief, notion, opiniona vague idea in which some confidence is placed“his impression of her was favorable”, “what are your feelings about the crisis?”, “it strengthened my belief in his sincerity”, “I had a feeling that she was lying”
(n)notion, whim, whimsy, whimseyan odd or fanciful or capricious idea“the theatrical notion of disguise is associated with disaster in his stories”, “he had a whimsy about flying to the moon”, “whimsy can be humorous to someone with time to enjoy it”