lästig
annoying
Unpleasant, disruptive, or irritating, so that one feels bothered.
Die ständigen Werbeanrufe sind wirklich lästig.
The constant advertising calls are really annoying.

annoying
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annoying
Unpleasant, disruptive, or irritating, so that one feels bothered.
Die ständigen Werbeanrufe sind wirklich lästig.
The constant advertising calls are really annoying.

The adjective 'lästig' (annoying) is closely related to the noun 'die Last' (the burden). Something that is 'lästig' feels like a small, disruptive burden or strain.
Diese Mücke ist wirklich lästig.
This mosquito is really annoying.
To express WHOM something bothers, a dative construction is often used. The person who feels bothered is in the dative.
Die laute Musik ist den Nachbarn lästig.
The loud music is annoying to the neighbors.
'Lästig' (annoying) often describes small, recurring disturbances. Typical combinations are 'eine lästige Angewohnheit' (an annoying habit), 'eine lästige Pflicht' (an annoying duty / chore), or 'lästige Insekten' (annoying insects).
Das Ausfüllen der Formulare ist eine lästige Pflicht.
Filling out the forms is an annoying chore.
pleasant
'angenehm' and 'lästig' describe opposite effects. 'angenehm' fits when something feels good or a person comes across as friendly. 'lästig' is used when something bothers you, annoys you, or creates extra effort. A task, a sound, or even a repeated question can be 'lästig'. In practical terms: what is 'angenehm' is something you like to have or experience; what is 'lästig' is something you would rather get rid of.

Die vielen kleinen Formulare sind lästig, aber sie müssen heute noch ausgefüllt werden.
The many small forms are annoying, but they still have to be filled out today.
Nach dem Gespräch mit meinem Vater war die Stimmung in der Küche wieder angenehm.
After the conversation with my father, the mood in the kitchen was pleasant again.