INAPPROPRIATE definition: not appropriate; not proper or suitable. See examples of inappropriate used in a sentence. The meaning of INAPPROPRIATE is not appropriate : unsuitable. How to use inappropriate in a sentence. Synonyms for INAPPROPRIATE: unsuitable, improper, incorrect, wrong, unhappy, unfit, irrelevant, unfortunate; Antonyms of INAPPROPRIATE: appropriate, suitable, correct, proper, right, relevant, happy, fitting Content that includes profanity, personal attacks or antisocial behavior (such as spamming or trolling ), or other inappropriate content or material will be removed. INAPPROPRIATE definition: 1. unsuitable: 2. unsuitable: 3. unsuitable, esp. for the particular time, place, or situation. Learn more. Adjective inappropriate (comparative more inappropriate, superlative most inappropriate) Not appropriate; not suitable for the situation, time, or place. Something that is inappropriate is not useful or suitable for a particular situation or purpose. The industry is inappropriate to the region's present and future needs. There is no suggestion that clients have been sold inappropriate policies. The word appropriate means correct or proper and since the little prefix in turns its meaning around, something inappropriate is considered not proper or suitable. Define inappropriate. inappropriate synonyms, inappropriate pronunciation, inappropriate translation, English dictionary definition of inappropriate. adj. Unsuitable or improper. in′ap·pro′pri·ate·ly adv. in′ap·pro′pri·ate·ness n. American Heritage® Dictionary of the English Language, Fifth Edition. Find 77 different ways to say INAPPROPRIATE, along with antonyms, related words, and example sentences at Thesaurus.com.