1. By open declaration
   "their policy has been avowedly Marxist"
   - professedly 
2. As acknowledged
   - true, admittedly, confessedly

See also: avowed

• syncretise
• syncretism
• syncretist
• syncretistic
• syncretistical
• syncretize
• syncytium
• syndactylism
• syndactyly
• syndesmosis
• syndetic
• syndic
• syndical
• syndicalism
• syndicalist
• syndicate
• syndication
• syndicator
• syndrome
• syne
• synecdoche
• synecdochic
• synecdochical
• synechia
• Synentognathi