vastainen

vasta +‎ -inen

vastainen (comparative vastaisempi, superlative vastaisin)

1. (weather, of wind) foul, head-, contrary

   vastainen tuuli

   headwind, foul wind

2. anti-, in-, un-

   lainvastainen = illegal

   sääntöjen vastainen = illegal, against the rules

   omantunnon vastainen = unconscionable

   sodanvastainen = anti-war

3. (time) occurring in the future

   vastaiset tapahtumat

   future events

4. (time, of a night in relation to the next day only) before

   keskiviikon vastainen yö

   the night before Wednesday

   syyskuun 21. päivän vastainen yö

   the night before September 21st

5. (chiefly geometry) opposite (as in opposite side)
6. against (rules or regulations)

• in the sense "anti-", that which is opposed is in genitive

vastainen

1. (nautical) headwind

   ohjata vastaiseen

   to steer upwind, to haul

   Tuuli kääntyy vastaiseen.

   The wind hauls.

• vastatuuli