irregular
US /ɪˈreɡ.jə.lɚ/
UK /ɪˈreɡ.jə.lɚ/

1.
irregular, desigual
not even or regular in shape, arrangement, or distribution
:
•
The coastline is very irregular, with many coves and inlets.
A costa é muito irregular, com muitas enseadas e entradas.
•
He has an irregular heartbeat.
Ele tem um batimento cardíaco irregular.
2.
irregular, anormal
not conforming to established rules or methods; abnormal
:
•
The verb 'to be' is an irregular verb in English.
O verbo 'to be' é um verbo irregular em inglês.
•
His attendance at meetings has been very irregular.
A sua presença nas reuniões tem sido muito irregular.