Tandem (adverb, noun)
(adv.) one behind another; (n.) 1. a close relationship between two or more people or things that depends on cooperation; 2. a bicycle with two seats and two sets of pedals, arranged one behind the other
– People are often quite surprised by the sport and leisure activities practiced by the blind. For example, tandem cycling is very popular.
– Some of the team members think that we need to complete product improvement project before we begin the marketing, but – I think we can proceed with both projects in tandem.
– My doctor wanted to run several blood tests in tandem.
closely, at the same time, in cooperation, together
1. lacking in reason or logic; 2. not thinking clearly
– Throwing in the towel and giving up when things don’t go your way is irrational.
– Nancy had a lot of ideas, some irrational, some pretty reasonable.
– Stephan had too much to drink and his thinking became – irrational.
– The irrationality of something is not an argument against its existence, it is just a condition of it.
unreasonable, illogical, foolish
reasonable, logical, rational