bu

this

katı

1. rigid, hard, tough
2. strict (exact; accurate; precise; governed or governing by exact rules)
3. solid (in the solid state)

bilişsel

Of or relating to the cognition, intelligence and behavior of humans; cognitive.

arkasında

1. second-person singular single-possession locative of arka
2. third-person singular single-possession locative of arka

etmenler

1. plural of etmen
2. nominative plural of etmen

nedir

third-person singular predicative of ne: what is?