haarig
hairy
Covered with hair or made of hair.
Der Hund hat sehr haarige Pfoten.
The dog has very hairy paws.

hairy
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hairy
Covered with hair or made of hair.
Der Hund hat sehr haarige Pfoten.
The dog has very hairy paws.

The adjective 'haarig' (hairy) is derived directly from the noun 'das Haar' (hair). The ending '-ig' is often used in German to form an adjective from a noun that means 'like' or 'full of' that noun.
Der neue Pullover ist von innen ganz weich und haarig.
The new sweater is completely soft and hairy on the inside.
You can recognize the figurative meaning 'schwierig' (difficult) by the fact that 'haarig' (hairy/tricky) describes an abstract noun. If it refers to a living being or an object, the literal meaning 'covered with hair' is usually meant.
Seine Brust war sehr haarig.
His chest was very hairy.
The meaning 'schwierig' (difficult) or 'heikel' (delicate/tricky) is colloquial. In formal or written contexts, you would more likely use words such as 'kompliziert' (complicated), 'schwierig' (difficult), or 'heikel' (delicate/tricky).
Aus dieser haarigen Situation kommen wir nur mit Glück wieder heraus.
We'll only get out of this tricky situation again with luck.
In the colloquial meaning, 'haarig' (tricky) is often combined with words such as 'Sache' (thing/matter), 'Angelegenheit' (matter), 'Situation' (situation), or 'Problem' (problem).
Die Reparatur des Motors ist eine haarige Angelegenheit.
Repairing the engine is a tricky matter.
simple / just
'einfach' and 'haarig' can both describe how manageable a situation is. 'einfach' means that something is easy to understand or do. 'haarig' is colloquial and means that something becomes difficult, delicate, or complicated. 'haarig' is especially suitable when a situation may become unpleasant or risky. In neutral situations, it is better to say 'schwierig' (difficult) or 'kompliziert' (complicated); 'haarig' sounds more casual and somewhat figurative.

Die Fahrt wird bei diesem Wetter ziemlich haarig.
The drive will be pretty tricky in this weather.
Nach der Arbeit kauft Frau Wagner ein einfaches Abendessen.
After work, Ms. Wagner buys a simple dinner.