Dazed or distracted with romantic sentiment.(adjective)
Affected by insanity; crazed.(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "moonstruck" in a sentence
"Dick was not "moonstruck," but he had a manly regard for Dora that did him credit."
"He can say of Johnson that he was "moonstruck," but it is from no lofty height of fancied superiority, but he uses the word as a naturalist uses a term to describe an object he loves."
"Again Matthew uses the word best translated as "moonstruck" to describe the patient's condition."