Addle

The man is addled

Addle [ˈadl]
Verb

- To make or become confused
- To become rotten (esp. egg),

Synonyms

confuse,  rot, decay, spoil

Usage

1. My brain grew more and more addle as i attempted to understand the instructions on the manual.

2. The eggs seemed to have addled as the were stored in unhygienic conditions.

Antonyms

clear headed, unconfused, fresh

Similar words:
Muddle