ground·less 
(groundlĭs)
(groundlĭs)adj.
Having no ground or foundation; unsubstantiated: groundless optimism. See Synonyms at baseless.
groundless·ly adv.
groundless·ness n.
- red squirrel
- redstart
- red state
- red supergiant
- red-tailed hawk
- red tape
- red tide
- redtop
- reduce
- reduced Planck's constant
- reducer
- reducibility
- reducible
- reducibly
- reducing agent
- reductant
- reductase
- reductio ad absurdum
- reduction
- reductional
- reductionism
- reductionist
- reductionistic
- reductive
- reductively