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

• countable
• countdown
• countenance
• counter
• counter cheque
• counter conditioning
• counter tube
• counter-drill
• counter-sabotage
• counteract
• counteraction
• counteractive
• counteractively
• counterargument
• counterattack
• counterattraction
• counterbalance
• counterbalanced
• counterbattery fire
• counterblast
• counterblow
• counterbombardment
• counterbore
• counterchallenge
• counterchange