Can i disable spellchecker popup but keep the red underline?
There ought to be a setting for the keyboard you are using.

I use "Gboard - the Google Keyboard (Beta)", it's quite good. Multilingual typing, probably in your languages. Easy to use Emoji searching, .GIFs, Swipe, 'Google Translate' typing, and it has voice input too. 

Settings -> General Management -> Language and Input, section "Input Correction" - set "Spelling Correction" to off. It still gives 'one line suggestions' but no 'pull down' like in your example.