1. Not able to be counted (e.g. because too many to count) 
2. (grammar) of a word that does not have a plural form

Encyclopedia: Uncountable

• expressional
• expressionism
• expressionist
• expressionistic
• expressionless
• expressive
• expressive aphasia
• expressive style
• expressively
• expressiveness
• expressly
• expresso
• expressway
• expropriate
• expropriation
• expulse
• expulsion
• expulsive
• expunction
• expunge
• expunging
• expurgate
• expurgated
• expurgation
• Issachar