Where does “crookish” come from?

crookish (English) comes from English crook, from English crooked, from Middle English croked, from Middle English croken, from Old English crācettan, from Proto-Germanic krēk-, from Proto-Indo-European ǵerh₂- — to grow old, to mature.

Ancestry of “crookish”, step by step

crookish traces back through two separate lines of ancestry.

via English crook

StepLanguageWordMeaning
1EnglishcrookA bend; turn; curve; curvature; a flexure; A...
2Englishcrookedsimple past tense and past participle of crook;...
3Middle Englishcroked
4Middle EnglishcrokenTo be bent; to curve; To make bent; to crook; To...
5Old Englishcrācettanto croak
6Proto-Germanickrēk-
7Proto-Indo-Europeanǵerh₂-to grow old, to mature

via English ish

StepLanguageWordMeaning
1EnglishishPronunciation spelling of is; somewhat,...
2English-ishTypical of, similar to, being like; Somewhat,...
3Middle English-ishAlternative form of -yssh
4Old English-isċ-ish
5Proto-West Germanic-iskCreates adjectives from nouns
6Proto-Germanic-iskazForms adjectives from nouns with the sense of...
7Proto-Indo-European-iskosCharacteristic of, typical of, pertaining to
Every word from Proto-Indo-European ǵerh₂-Every word from Proto-Germanic krēk-Every word from Old English crācettan