complimentary
1. [ adjective ] conveying or resembling a compliment
Examples:

"a complimentary remark"

Related terms: uncomplimentary laudatory encomiastic favorable
2. [ adjective ] costing nothing
Synonyms: free gratuitous gratis costless
Examples:

"complimentary tickets"

Related terms: unpaid
3. [ adjective ] obsequiously complimentary
Synonyms: adulatory
Examples:

"they listened with flattering interest"

Related terms: flattering
Similar spelling:   compliment
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  complementarity
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  complicity
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  complementation
  complacently
  compulsively
  compulsive
  compulsion
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  compliance
  complexion
  completion
  complicated
  complexness
  complection