1 to understand

2 to realize

3 to find out

1 psychology

2 mentality

1 to arrange

2 to tidy up

3 to sort out

4 to straighten out

5 to list systematically

6 to collate (data, files)

7 to pack (luggage)

1 texture

2 grain (of wood)

3 inner essence

4 intrinsic order

5 reason

6 logic

7 truth

8 science

9 natural science (esp. physics)

10 to manage

11 to pay attention to

12 to run (affairs)

13 to handle

14 to put in order

15 to tidy up

1 reason

2 rationality

3 rational

1 lit. to know one and understand half (idiom); a smattering of knowledge

2 dilettante

3 amateur

1 to be impervious to reason (idiom)

2 unreasonable

1 not understanding things (idiom); devoid of sense

1 lit. not requiring a detailed understanding (idiom); only looking for an overview

2 not bothered with the details

3 superficial

4 content with shallow understanding

1 to completely ignore (idiom)

2 to pay no attention to

3 not to be in the least concerned about