peaked /piːkt/adjective 1/ˈpiːkɪd/ adjective 1forms 4 adjective1 •Having a peak or peaks.The wizard wore a peaked cap. peaked /ˈpiːkɪd/ adjective1 •Sickly-looking, peaky.She looked peaked and tired ever since he had volunteered for the army. — 2000 formsmore peaked · more peakèd · most peaked · most peakèd